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PiXtend V2 -L- Hardware Manual

6.7. Serial interface

PiXtend V2 -L- has one serial interface:

–

RS232

classic serial computer interface - point-to-point connection

–

RS485

differential serial interface - bus system (fieldbus) known from
Profibus, Modbus RTU, DMX and many more

–

CAN

differential serial interface - bus system (fieldbus) known from the
automotive sector and from CANopen, J1939 (in the automation area)

RS232 and RS485 share the UART interface of the Raspberry Pi. Between the interfaces
can be switched via GPIO.

Further information and details about the individual interfaces can be found on the
following pages.

www.pixtend.com

130 / 146

Figure 81: Terminal block -

serial interfaces

Содержание PiXtend V2 -L-

Страница 1: ...ty Instructions Scope of Delivery Factory settings Installation Commissioning Technical Data Connection Notes Qube Solutions GmbH Arbachtalstr 6 D 72800 Eningen Germany https www pixtend com info pixt...

Страница 2: ...ardware Manual Version History Version Date Description Editor 1 00 06 08 18 Document created TG 1 01 09 08 18 Small corrections of spelling and formatting TG www pixtend com Copyright by Qube Solutio...

Страница 3: ...tance 14 3 Scope of Delivery 15 3 1 PiXtend V2 L Extension Board 16 3 2 Housing Parts 17 3 2 1 DIN rail housing 17 3 2 2 Stainless Steel Hood 18 3 3 ePLC Module 19 3 3 1 ePLC Basic 19 3 3 2 ePLC Pro 2...

Страница 4: ...d V2 L Microcontroller 81 6 4 Digital inputs and outputs 88 6 4 1 Digital inputs 88 6 4 2 Digital outputs 93 6 4 3 Relay outputs 98 6 4 4 GPIOs as digital inputs and outputs 103 6 5 Analog Inputs Outp...

Страница 5: ...es of the following types PiXtend V2 L Extension Board QS Artikelnummer 620 PiXtend V2 L ePLC Basic QS Artikelnummer 621 PiXtend V2 L ePLC Pro QS Artikelnummer 622 The documents for the predecessor se...

Страница 6: ...s de AVR ATmega and the associated logo are registered trademarks of Atmel Corporation www atmel com or Microchip Technology Corporation www microchip com Debian and Raspbian are protected trademarks...

Страница 7: ...nformation to avoid malfunctions and accidental misuse Warning This symbol indicates a warning and can result in damage to property if not observed Danger This symbol indicates a high hazard which can...

Страница 8: ...tion High Voltage This symbol indicates a warning of dangerous electrical voltages Non observance can result in damage to property and or personal injury including death Warning ESD Endangered Compone...

Страница 9: ...ol actuators The logic programming of inputs and outputs can be done among other things with the software CODESYS V3 from the company 3S Smart Software Solutions GmbH Qube Solutions also provides comp...

Страница 10: ...nge no jumper is set All analog inputs are configured for a 0 10 V range no jumper is set CAN AO Jumper is set to AO analog outputs active CAN inactive RS485 A M Jumper is set to A automatic send rece...

Страница 11: ...compliance with the information contained in the manuals and safety data sheets will lead to the loss of certification and approval for the European Economic Area WEEE Registration No DE 15868016 The...

Страница 12: ...of the batteries accumulators to us must be sufficient postage in all cases Returns of batteries accumulators should be addressed to Qube Solutions GmbH Arbachtalstra e 6 D 72800 Eningen GERMANY Batt...

Страница 13: ...areas The permissible operating temperature is between 0 C and 50 C 1 PiXtend the Raspberry Pi as well as all cables connectors and power supplies must be kept away from liquids The PiXtend modules m...

Страница 14: ...ns GmbH Arbachtalstr 6 D 72800 Eningen GERMANY How to reach us Tel 49 0 7121 8806920 Fax 49 0 7121 2848662 info pixtend com www pixtend com 2 9 Assistance A lot of information tips and tricks can be f...

Страница 15: ...n be damaged by electrostatic discharge The components may only be touched at the edges of the circuit boards on mechanical screw connections or plug connectors Avoid direct contact with electronic co...

Страница 16: ...t completely assembled 1 4 Screw cross slot M2 5 x 6 mm 2 1 Ribbon cable 40 pole 3 24 Jumper 2 jumpers already used on assembly standard black 4 1 Safety data sheet multilingual 5 Table 1 Scope of del...

Страница 17: ...105 x 25 5 mm 1 2 Side panel 2 2 Locking element 3 1 Earth clamp 4 4 Screw for side part cross slot long 5 2 Screw for locking element cross slot short 6 Table 2 Scope of delivery DIN rail housing ar...

Страница 18: ...on print two parts 241 x 102 x 35 2 mm 1 6 Screw cross slot M2 5 x 6 mm 2 2 Screw cross slot M2 5 x 20 mm 3 2 Spacer with external thread M2 5 x 15 mm 4 Table 3 Scope of delivery Stainless Steel Hood...

Страница 19: ...consisting of PiXtend V2 L Raspberry Pi microSD card fully assembled ready 1 1 Adapter microSD to SD 2 24 Jumper 2 jumpers already used on assembly standard black 3 1 Safety data sheet multilingual 4...

Страница 20: ...berry Pi microSD card DIN rail housing stainless steel hood fully assembled ready 1 1 Adapter microSD to SD 2 24 Jumper 2 jumpers already used on assembly standard black 3 1 Safety data sheet multilin...

Страница 21: ...ctory Note Please observe the assembly and safety instructions which are marked with warning signs in the further course of the assembly instructions Note Care must be taken when handling electronic m...

Страница 22: ...r PH1 optional torque wrench with Phillips bit PH1 adjustment 0 4 Nm 4 1 2 Assembly The combination of Raspberry Pi and PiXtend V2 L is quickly done A pre assembled 40 pin flat ribbon cable is include...

Страница 23: ...ct between soldering points and electronic components on the Raspberry Pi and PiXtend circuit boards Now the Raspberry Pi can be turned up and placed on the four spacers of your PiXtend V2 L board The...

Страница 24: ...ware Manual Tighten the small screws with feeling If you have a torque wrench use a tightening torque of 0 4 Nm www pixtend com Copyright by Qube Solutions GmbH 24 146 Figure 8 Screw the Raspberry Pi...

Страница 25: ...l housing 4 2 1 Tools The following tools are required for assembling the DIN rail housing Phillips screwdriver PH1 possibly a normal hammer or rubber hammer When installing the stainless steel hood w...

Страница 26: ...be more suitable than the other The earthing claw is inserted in the center of the aluminum profile and pressed into the recess with your thumb The side of the claw which only has one contact tab poi...

Страница 27: ...re carefully tightened and screwed as straight as possible From the other side on which the side part has not yet been mounted the locking element is inserted on the back of the profile Figure 11 On t...

Страница 28: ...rail housing is later installed in a control cabinet or control box horizontal mounting of the housing the locking element is located at the bottom www pixtend com Copyright by Qube Solutions GmbH 28...

Страница 29: ...file Then they are fixed with the small screws Now we can insert the PiXtend V2 L board into the profile The profile has several floors into which boards could be inserted We use the top floor www pix...

Страница 30: ...cond side part can be mounted and fixed with the remaining two screws Do not be surprised at the fact that the board is still slightly beyond the profile This small overhang is covered by the side par...

Страница 31: ...ted to the grounding claw The connection is made with a so called flat plug width 6 35 mm Further information on the topic of PE connection and safety can be found in the following section 4 2 3 Stain...

Страница 32: ...igure 17 and then pressed flat this causes the locking element to engage During disassembly the entire unit is pushed upwards The locking element springs in and the device detaches itself from the DIN...

Страница 33: ...h voltages should the analog inputs AI0 AI3 and the digital inputs DI0 DI15 be configured Remove or insert the jumpers accordingly The switch 5V_PI should be set to ON The power supply for Raspberry P...

Страница 34: ...steel housing consists of two parts The large lower part of the hood is twisted so that it can be guided over the Raspberry Pi and placed on the six spacers on the PiXtend V2 L board Figure 20 The se...

Страница 35: ...on the four spacers again The two M2 5 x 15 mm spacers with external thread are screwed in according to Figure 21 with 0 4 Nm www pixtend com Copyright by Qube Solutions GmbH 35 146 Figure 20 Lower h...

Страница 36: ...plied If you have a torque wrench use a tightening torque of 0 4 Nm Before the upper part of the hood is placed over the Raspberry Pi we take a look at the flat ribbon cable connecting Raspberry Pi an...

Страница 37: ...y Pi Press the ribbon cable against the 40 pin connector to obtain the following result Also make sure that the ribbon cable does not touch the lower part of the hood and that there is a gap of at lea...

Страница 38: ...slot provided long holes grooves of the lower hood Two of the four M2 5 x 6 mm screws with which Raspberry Pi and PiXtend have been screwed so far fix the upper cover onto the previously installed 15...

Страница 39: ...d The long screws must reach through the holes of the Raspberry Pi and the spacers The insertion of the screws must be free of any forces Also these two screws are fixed with feeling If you have a tor...

Страница 40: ...ive earth PE protective earth Cables and devices with dangerous voltages must only be connected by trained and legally qualified personnel The stainless steel hood has a special connection for the pro...

Страница 41: ...in sleeves with snap in nose which snaps into the hood and protects against unintentional loosening pulling off Check the flat plug for a tight fit The outer conductors are to be protected all pole v...

Страница 42: ...steps Then you create an SD card from one of the provided SD card images with the Basic Image C Python Node RED OpenPLC or CODESYS Control Demo for your Raspberry Pi If you have a PiXtend V2 L Extens...

Страница 43: ...d PiXtend V2 L can not communicate The term SPI_EN is called SPI Serial Peripheral Interface Enable Switch PI_5V This switch is used to decide whether or not the 5 V supply of PiXtend V2 L and Raspber...

Страница 44: ...alfunctions overheating of components or their defect If you want to supply the Raspberry Pi with its own separate power supply set the PI_5V switch to OFF However for the sake of simplicity we recomm...

Страница 45: ...he analog input is in measuring range 0 10 V factory setting If a jumper is plugged in the range of the input changes to 0 5 V The reduction of the voltage range can make sense if only small signals u...

Страница 46: ...h can lead to unexpected behavior Check the correct jumper setting before a signal is connected to the inputs If no jumper is plugged in the analog input is in the 24 V range factory setting If a jump...

Страница 47: ...the side with the inscription A as shown in Fig 32 This is the recommended setting for send receive switching of the RS485 interface Only insert this jumper if absolutely necessary for your applicatio...

Страница 48: ...terminating resistor is not active By inserting the jumper between the middle pin and the pin with the label ON the termination is activated Whenever PiXtend represents the first or last node of a bu...

Страница 49: ...used in parallel a preselection is required In the factory settings the analog outputs are selected the jumper is connected to the middle pin and the pin labeled AO Fig 35 If you want to use CAN chang...

Страница 50: ...inux Tools including the PiXtend C library pxdev PiXtend Python Library V2 with examples Node RED OpenPLC CODESYS Control Demo with CODESYS V3 5 Runtime Extension for the Raspberry Pi PiXtend Always u...

Страница 51: ...e from our download area in which the SD card image is located must be opened and unpacked Store the image file at an easy to reach place i e the desktop Start the Win32DiskImager program with Adminis...

Страница 52: ...or you are prompted to format the media on these dialogs always click on the Cancel button and close any windows that may have appeared This is no error situation You get these messages because Micro...

Страница 53: ...fer to section 5 4 Connection of alternative power supplies from page 53 of this document if you want to use power supplies other than those described below The exact requirements for a power supply c...

Страница 54: ...ins the following components Plug in power supply fixed output voltage 24 V DC 1 04 A Adapter from female socket to terminal blocks Connection leads red and blue 0 75 mm 10 cm length The adapter is pl...

Страница 55: ...ction cables can be connected to your PiXtend V2 L Connect the red wire to one of the terminals labeled VCC and the blue wire to GND see Fig 39 The terminal block for the supply voltage POWER SUPPLY I...

Страница 56: ...ore using the power supply for the first time The power supply can now be plugged into a 115 or 230 V AC socket The green LED with the designation 5V starts to light up and signals the presence of the...

Страница 57: ...ore applying voltage to power supplies or your PiXtend V2 L module Note Please ensure that the power supply complies with the legal requirements of your country before purchase In case of doubt ask th...

Страница 58: ...nly permitted by authorized personnel The following figure shows a 60 W DIN rail power supply which can be used for PiXtend V2 L Figure 41 shows in addition to the regular connection of the supply vol...

Страница 59: ...a GND connection which is used when an additional power supply e g for other voltages is to be used to supply the digital outputs With the illustrated power supply figure 41 the voltage can still be s...

Страница 60: ...bbon cable correctly inserted Check the tight fit on both sides on PiXtend and on the Raspberry Pi Problem The digital outputs do not work In the 1 or true state there is no voltage at the output or t...

Страница 61: ...red as an output and set to logical 1 TRUE see Fig 42 The GPIO24 is the signal which is transmitted via the SPI_EN switch and activates the data transmission If the problem is not resolved please note...

Страница 62: ...ponent for correct operation only one program at a time is allowed to communicate with the micro controller In C programs the Input and Output structure variables must be declared globally or locally...

Страница 63: ...16x digital inputs P 88 12x digital outputs P 93 6x PWM Servo outputs P 125 4x Relays P 98 4x GPIOs usable as input or output P 103 with DHT sensors P 129 Analog I Os 4x analog voltage inputs P 110 2...

Страница 64: ...mm Extension Board ePLC Basic ePLC Pro Weight ca 248 g ca 299 g ca 790 g Extension Board ePLC Basic ePLC Pro Current consumption max 1 2 A at 12 V DC max 0 6 A at 24 V DC without loads at digital out...

Страница 65: ...prevents further heating by means of built in mechanisms the computing power is limited However the above mentioned load case of 100 on all cores is not realistic or is not a practical application of...

Страница 66: ...teel hood Raspberry Pi 3 B original without heat sink or other modifications Results Load on CPU0 at 25 C Load on CPU0 trig calculations Max permissible ambient temperature 75 17 25 Million per second...

Страница 67: ...r the case that such a high computing power was necessary The results obtained with CODESYS can also be transferred to other programs programming systems C Python OpenPLC We introduce CODESYS as this...

Страница 68: ...DC voltage The majority of the circuit parts on PiXtend V2 L are supplied with 5 V part with 3 3 V The 3 3 V are taken from the Raspberry Pi Via the 40 pin flat ribbon cable connection the 5 V supply...

Страница 69: ...tput current self resetting Cooling ja passive heat sink circuit board Reverse polarity protection ja up to 30 V EMC Surge Burst Protection ja Transil diode bidirectional Isolation nein Status display...

Страница 70: ...The internal voltage regulator of PiXtend has an energy reserve This ensures an uninterrupted power supply for voltage drops at the supply input of 10 milliseconds The energy reserve is designed to e...

Страница 71: ...s connected to the external power supply via the VCC and adjacent GND ports The Raspberry Pi connects to a second power supply 5 1V 2 5A minimum via the microUSB socket Warning If the PI_5V switch is...

Страница 72: ...ed via the flat band cable connection The following connections of the Raspberry Pi B 2 B 3 B 3 B are not used on PiXtend V2 L and are therefore available for other applications GPIO27 GPIO25 GPIO5 GP...

Страница 73: ...es of the GPIOs are always used in this manual and in other documents of the company Qube Solutions Warning The flat band cable connection between Raspberry Pi and PiXtend V2 L must never be inserted...

Страница 74: ...pin header see Figure 47 Applications EEPROM flash memory Sensors ultrasound temperature air pressure CO2 etc Data connection to integrated circuits such as microcontrollers FPGAs ASICs port expander...

Страница 75: ...I C clock line clock 5V Supply voltage 5 1 V 5 The GND and 5 V connector which is also located on the four pin connector must be connected to external devices on the I C bus Warning The I C lines and...

Страница 76: ...s used the permissible load on the RPi USB ports is reduced to 1x 500 mA without display 2x 500 mA Warning The connection has no fuse protection overloads and short circuits can lead to the breakdown...

Страница 77: ...he Raspberry Pi are fed from an internal capacitor After the power supply has been restored and the PiXtend system is restarted the previously backed up data is provided by the microcontroller and can...

Страница 78: ...ys released via the actuating push button Connection data Value Comment cable cross section min max 0 2 mm 1 5 mm for rigid and flexible lines cable cross section with with wire end ferrule min max 0...

Страница 79: ...ut the mentioned housing parts the spacers ensure a secure stand and prevent the bending of the printed circuit board when inserting and loosening cables In operation PiXtend must be installed in a ho...

Страница 80: ...side Lead free RoHS II compliant yes Holes X direction Y direction For Raspberry Pi model B 2 B 3 B for the assembly 7 5 mm 7 5 mm 65 5 mm 65 5 mm 5 mm 5 mm 120 5 mm 120 5 mm 181 5 mm 190 5 mm 231 mm...

Страница 81: ...GPIOs as input output or for temperature and humidity sensors DHT11 22 AM2302 Signal processing and data processing Watchdog functionality and voltage monitoring brownout detection data protection lay...

Страница 82: ...the SPI_EN switch the SPI data connection between Raspberry Pi and PiXtend can be separated The microcontrollers each have a separate ISP connector www pixtend com Copyright by Qube Solutions GmbH 82...

Страница 83: ...roller The controller is always up to date and functionally tested when the PiXtend V2 L devices are delivered The approval and guarantee of the PiXtend V2 L modules are lost when a custom firmware is...

Страница 84: ...ry Pi GPIO23 pin 16 is configured as an input the microcontroller is in the normal operating state 2 If the GPIO23 is configured as an output the state of the controller depends on the output level of...

Страница 85: ...matically In addition the GPIO24 Pin 18 must be configured as an output and switched to HIGH 3 3 V In the PiXtend test programs under Linux or with CODESYS the GPIO24 is already set automatically to e...

Страница 86: ...Atmel5 Note The approval and guarantee of the assembly will be lost if own firmware is loaded 5 http www atmel com Images Atmel 2521 AVR Hardware Design Considerations_ApplicationNote_AVR042 pdf www p...

Страница 87: ...P connector is not required for normal operation of PiXtend V2 L and should not be connected The ISP port is a service port on which only lines less than 3 meters can be connected www pixtend com Copy...

Страница 88: ...s light barriers Outputs of other control units Outputs of integrated circuits TTL level CMOS level Two different voltage ranges can be set one jumper per input In the 24 V range the inputs correspond...

Страница 89: ...current 5 6 mA Reverse polarity protection yes Up to 30 V Isolation no Status display LED orange Description 0 15 on PCB DI0 DI15 on hood Permissible cable length 30 m Table 13 Technical data digital...

Страница 90: ...polarity protection yes Up to 9 V Isolation no Status display LED orange Description 0 15 on PCB DI0 DI15 on hood Permissible cable length 30 m Table 14 Technical data digital inputs 5V area Warning...

Страница 91: ...s the selection between two voltage ranges adaptation of the switching level The pin strips on which the jumpers can be inserted are located behind the connection terminals of the digital inputs on Pi...

Страница 92: ...L must be connected to the GNDs of the other power supply units We recommend to connect the ground potentials of all power supplies used at a central point bridged terminal block to avoid ground loops...

Страница 93: ...lve digital outputs are short circuit and overload proof The outputs correspond to protected and short circuit proof outputs as in the PLC standard IEC 61131 2 These are so called high side switches w...

Страница 94: ...must be provided externally EMC Surge Burst Protection yes Transildiode bidirektional Isolation no Status display LED green Description VCC DOx x Permissible cable length 30 m Table 15 Technical data...

Страница 95: ...Maximum switching capacity 2 5 W 6 W 12 W at 5 V DC at 12 V DC at 24 V DC ON resistance 350 m At logical 1 and nominal load Short circuit protection Current limit Overload protection yes yes yes ther...

Страница 96: ...on the load and ambient temperature the power transistors can have temperatures of up to 75 C Direct touch should be avoided Output currents greater than 0 5 A are not permitted in normal operation ww...

Страница 97: ...V This can be achieved for example by a free running diode 1N4004 as shown in fig 62 Inductive loads are DC motors relays magnetic coils etc The ground connections GND of external power supply units...

Страница 98: ...eeds Direct operation of DC or AC drives Fans blowers heaters and lighting Large loads with less frequent switching cycles The universal relay can be used to switch everything which requires a maximum...

Страница 99: ...for inductive loads a free running diode must be provided externally Contact Resistance 100 m Response time 10 ms excl bounce Fall time 5 ms excl bounce Power consumption 0 25 W per active relay Mech...

Страница 100: ...sing must prevent direct contact with energized components cables and metal parts We offer matching housing parts for the assembly on a DIN rail The PiXtend stainless steel hood must be securely conne...

Страница 101: ...rking may occur when the load is switched off which could interfere with other devices and damage the relay contacts Inductive loads are motors relays magnetic coils power supplies with transformers e...

Страница 102: ...ection must always be used In the case of inductive loads a so called snubber network RC element is to be used externally which intercepts and attenuates voltage peaks during switch off Inductive load...

Страница 103: ...ol units or microprocessors Connection of temperature and humidity sensors DHT11 DHT22 AM2302 Unlike other inputs and outputs on PiXtend V2 L the GPIOs only have basic protection devices Therefore onl...

Страница 104: ...5 V DC Maximum input voltage 5 5 V minimum 0 5 V PullUp resistor yes can be activated by software per channel 35 k Reverse polarity protection no Isolation no Status display no Permissible cable leng...

Страница 105: ...humidity sensor DHT11 DHT22 AM2302 is to be connected to the GPIOs a pull up resistor must be connected to the data line SDA of the sensor as shown in Fig 61 For cable lengths greater than 2 m we reco...

Страница 106: ...load 3 k 1 k for min 4 5 V output voltage for 5V TTL high level Load types ohmic Short circuit current 15 mA Rated switching capacity 10 mW Short circuit protection yes Short circuit against GND Isol...

Страница 107: ...nd tolerate at least 20 mA It is therefore possible to connect a green LED directly between a GPIO output and GND If the outputs are to be connected to TTL inputs of other devices make sure that the i...

Страница 108: ...d outputs Four voltage inputs AI0 AI3 Two current inputs AI4 AI5 Two voltage outputs AO0 AO1 Further information and details about the mentioned analog I Os can be found on the following pages www pix...

Страница 109: ...xternal shunt voltage at the resistor Read out of PT100 1000 sensors with external pre amplifier Connect to the analog outputs of other control units The inputs are robust and can withstand overvoltag...

Страница 110: ...can always stay in the 10 V range no jumper and thus enjoy the greater flexibility and robustness of the inputs In the 5 V range jumper plugged in however the same resolution is available for a small...

Страница 111: ...iplexer Conversion time 2 s averaging 10 values 20 s Digital resolution 10 bit Smallest digital step LSB 9 77 mV Maximum measurement error at 25 C 1 0 1 V of the value range at default config Temperat...

Страница 112: ...nversion time 2 s averaging 10 values 20 s Digital resolution 10 Bit Smallest digital step LSB 4 88 mV Maximum measurement error at 25 C 1 0 05 V of the value range at default config Temperature coeff...

Страница 113: ...ugged of the analog voltage inputs If you insert the jumper the software must react accordingly adjust the conversion factor In CODESYS for example the jumper position can be conveniently set via PiXt...

Страница 114: ...sitive resistor LDR or the evaluation of a rotary potentiometer If the 5 V range is used one of the two 5V power supplies of PiXtend V2 L can be used for the supply of sensors or voltage dividers Curr...

Страница 115: ...ed in the direct vicinity of large pulsed currents e g drives or other sources of interferences If PiXtend is used in a metal housing or control box the shield must be placed on a grounded and bare me...

Страница 116: ...PE shielding must be available or produced Otherwise the wire shield should be separated twisted and connected to the GND of PiXtend For cables less than three meters unshielded cables can also be us...

Страница 117: ...ith multiplexer Conversion time 2 s averaging 10 values 20 s Digital resolution 10 bit Smallest digital step LSB 24 4 uA Maximum measurement error at 25 C 1 0 2 mA of the value range at default config...

Страница 118: ...ents When using alternating currents the input filters must be observed Only measurements in the positive range are possible Although negative currents can be created they can not be evaluated Warning...

Страница 119: ...d V2 L The measuring current flows through a shunt resistor with a value of 20 So if a voltage sensor is connected to the output the maximum permissible measuring current of 20 mA flows even at very l...

Страница 120: ...if such defects are avoided it is not recommended to let the input currents rise permanently or in normal operation above 20 mA Currents greater than 20 5 mA can not be evaluated in the software The...

Страница 121: ...of sine rectangle and triangle voltages etc Connect to analog inputs of other control units and power amplifiers Control analog displays The two outputs are short circuit proof and can drive a current...

Страница 122: ...the potentiometer setting Temperature coefficient 0 025 per C in the range 0 50 C ambient temperature Data format 16 bit integer 32 bit float raw value right aligned output value in V Short circuit pr...

Страница 123: ...utputs The fine tuning of the analog outputs is carried out during the production of Qube Solutions However after a certain time it may be useful to repeat this trimming Each channel has its own poten...

Страница 124: ...tion diagram can be found in the analog inputs on page 115 in this document The Digital to Analog Converter DAC for the AOs is connected to the Raspberry Pi via SPI Since the analog outputs AO and the...

Страница 125: ...s and the PiXtend power supply On these special outputs either pulse width modulated PWM signals with adjustable frequency and duty cycle can be output or RC servos can be connected directly Applicati...

Страница 126: ...inal output current 2 mA Nominal load resistance 3 k for min 4 5 V output voltage Analog filtering Cut off frequency 830 kHz 1st order lowpass Load types ohmic Short circuit current 15 mA Rated switch...

Страница 127: ...Mode the duty cycle can be freely configured for each channel The frequency is configured together for both channels 16 bit PWMs common PWMYA PWMYB In Universal Mode the frequency and the duty cycle...

Страница 128: ...ufacturer must be observed Warning An external power supply or a rechargeable battery usually 4 7 V DC is required to operate model building services The 5V of PiXtend V2 L Raspberry Pi must not be us...

Страница 129: ...which can be obtained from electronics dealers or directly from sales platforms such as Ebay or Amazon from the Far East The price range is 3 15 per sensor The sensors are designed for indoor use The...

Страница 130: ...any more CAN differential serial interface bus system fieldbus known from the automotive sector and from CANopen J1939 in the automation area RS232 and RS485 share the UART interface of the Raspberry...

Страница 131: ...transfer or Linux terminal Data exchange with other control devices measuring instruments scales and microcontrollers Service access for telephone systems Connection to analog modems and other electr...

Страница 132: ...hort circuit against GND Isolation no Input impedance 5 k from RX to GND Status display no Permissible cable length 3 m 30 m unshielded cables shielded cables Table 25 Technical data RS232 Warning If...

Страница 133: ...nection or the application of shielding can be found in section 6 5 1 1 Voltage inputs from page 110 in this document With standard settings for the UART interface under Raspbian Linux the RS232 inter...

Страница 134: ...uch more The RS485 transceiver on PiXtend is short circuit proof and robust against interference Through a jumper directly next to the terminal block can be a 120 terminating resistor can be optionall...

Страница 135: ...ants on the bus Maximum number of participants on the bus theoretically 32 Differential output voltage Min 1 5 V max 8 V with maximum load 27 without load minimum differential input voltage 0 2 V inpu...

Страница 136: ...be connected at the ends of the line structure first and last bus node If PiXtend is one of these bus ends the jumper must be set to ON In series with the 120 resistor is a 1 nF capacitor This preven...

Страница 137: ...Sending receiving is automatically switched over without having to pay any attention to the software or the bus driver Particularly suitable for Modbus RTU Recommended mode for the RS485 interface on...

Страница 138: ...control units microcontrollers measuring instruments and much more Data connection to control units microcontrollers in the automotive sector The CAN transceiver on PiXtend is short circuit proof and...

Страница 139: ...ically 112 Differential output voltage min 1 5 V max 3 V at 50 load without load minimum differential input voltage 1 V input threshold Maximum voltages 42 V to CANH or CANL to GND Short circuit curre...

Страница 140: ...ends the jumper must be set to ON The CAN controller is connected to the Raspberry Pi via SPI Since the analog outputs AO and the CAN controller share a SPI chip select CS1 you must first switch to th...

Страница 141: ...GPIO of the Raspberry Pi is important The interrupt line is connected to the GPIO4 If the GPIO is configured as an input it can be queried in the software or by the kernel module used The interrupt l...

Страница 142: ...us Eigenschaft Wert Kommentar Property Value Comment Type of RTC time and date Seconds minutes hours day of month month day of week year and year 12 and 24 hour format Data connection I C bus max 100...

Страница 143: ...32 Figure 19 Raspberry Pi lifted from PiXtend flat ribbon cable remains connected 34 Figure 20 Lower hood part placed 35 Figure 21 Raspberry Pi with two spacers screwed 35 Figure 22 Assemble the lower...

Страница 144: ...on of the digital inputs 91 Figure 60 Principle circuit diagram GND connection 92 Figure 61 Terminal block digital outputs 93 Figure 62 Principle circuit diagram Connection of the digital outputs 97 F...

Страница 145: ...onnection of the RS232 interface 133 Figure 83 Principle circuit diagram Connection of the RS485 interface 136 Figure 84 Jumper for send receive switching of the RS485 interface 137 Figure 85 Principl...

Страница 146: ...l blocks 78 Table 12 Technical data printed circuit board PCB 80 Table 13 Technical data digital inputs 24V area 89 Table 14 Technical data digital inputs 5V area 90 Table 15 Technical data DO supply...

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