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to the UART module using the ConfigIO function.

BaudFactor16 (BaudFactor8)

: This 16-bit value sets the baud rate according the following formula: BaudFactor16 = 2

–

48000000/(2 x Desired Baud). For example, a BaudFactor16 = 63036 provides a baud rate of 9600 bps. (With hardware
revision 1.21, the value is only 8-bit and the formula is BaudFactor8 = 2

– TimerClockBase/(Desired Baud) ).

5.2.17 - AsynchTX

Requires U3 hardware version 1.21. Sends bytes to the U3 UART which will be sent asynchronously on the transmit line.

Command:

Byte

Checksum8

0xF8

1 + NumAsynchWords

0x15

Checksum16 (LSB)

Checksum16 (MSB)

0x00

NumAsynchBytesToSend

AsynchByte0

...

Response:

Byte

Checksum8

0xF8

0x02

0x15

Checksum16 (LSB)

Checksum16 (MSB)

Errorcode

NumAsynchBytesSent

NumAsynchBytesInRXBuffer

0x00

NumAsynchWords

: This is the number of asynch data bytes divided by 2. If the number of bytes is odd, round up and add

an extra zero to the packet.

NumAsynchBytesToSend

: Specifies how many bytes will be sent (0-56).

NumAsynchBytesInRXBuffer

: Returns how many bytes are currently in the RX buffer.

5.2.18 - AsynchRX

Requires U3 hardware version 1.21. Reads the oldest 32 bytes from the U3 UART RX buffer (received on receive terminal). The
buffer holds 256 bytes.

Command:

Byte

Checksum8

0xF8

0x01

0x16

Checksum16 (LSB)

Checksum16 (MSB)

0x00

Flush

Response:

Byte

Checksum8

0xF8

1 + NumAsynchWords

0x15

Checksum16 (LSB)

Checksum16 (MSB)

Errorcode

NumAsynchBytesInRXBuffer

AsynchByte0

...

AsynchByte31

Flush

: If nonzero, the entire 256-byte RX buffer is emptied. If there are more than 32 bytes in the buffer that data is lost.

NumAsynchBytesInRXBuffer

: Returns the number of bytes in the buffer before this read.

AsynchByte#

: Returns the 32 oldest bytes from the RX buffer.

5.2.19 - I²C

Requires U3 hardware version 1.21+. Sends and receives serial data using I²C (I2C) synchronous communication.

Содержание LJU3-LV

Страница 1: ...sponsible for shipping to LabJack Corporation and LabJack Corporation will pay for the return shipping Limitation of Liability LabJack designs and manufactures measurement and automation peripherals t...

Страница 2: ...entry below the serial number to bring up the U3 configuration panel Click on Test in the configuration panel to bring up the test panel where you can view and control the various I O on the U3 If LJ...

Страница 3: ...14 exe Size 49 99 MB Upload date 2014 10 14 12 45 The LabJack Control Panel application LJCP handles configuration and testing of the UD series hardware Click on the Find Devices button to search for...

Страница 4: ...or Ethernet devices using specified IP addresses Only applies to UE9 device LJControlPanel is normally installed by the main LabJack installer which is the link at the top of the page 1 2 Self Upgrade...

Страница 5: ...rent I O areas Communication Edge Screw Terminal Edge DB Edge The communication edge has a USB type B connector with black cable connected in Figure 2 1 All power and communication is handled by the U...

Страница 6: ...tal operations including analog digital configuration are ignored on these 4 fixed analog inputs Timers and counters can appear on various pins but other I O lines never move For example Timer1 can ap...

Страница 7: ...Negative Channel Numbers Positive channel 31 puts the internal Vreg 3 3 volts on the positive input of the ADC See Section 2 6 4 for information about the internal temperature sensor If the negative c...

Страница 8: ...aging the U3 but more thought is required to determine what is necessary to make useful measurements with the U3 or any measurement device Voltage versus ground The single ended analog inputs on the U...

Страница 9: ...es are noted connect the ground to U3 SGND with a 100 series resistor Then again use the DMM to measure the voltage of each signal wire before connecting to the U3 Another good general rule is to use...

Страница 10: ...Figure 2 6 2 where one of the resistors is known and the other is the unknown If Vin is known and Vout is measured the voltage divider equation can be rearranged to solve for the unknown resistance 2...

Страница 11: ...e other channel to GND with a small jumper and then take a differential reading of your channel compared to that grounded channel The nominal input range of a high voltage single ended analog input is...

Страница 12: ...d offset but of course the op amp must be powered with supplies greater than the desired output range depending on the ability of the op amp to drive it s outputs close to the power rails If 10 12 or...

Страница 13: ...h bit of I O corresponds to the same bit in the parameter e g the direction of FIO0 is set in bit 0 of parameter FIODir For instance in the low level function ConfigU3 the parameter FIODirection is a...

Страница 14: ...tal input to about 3 3 volts logic high When the switch is closed the ground connection will overpower the pull up resistor and pull the digital input to 0 volts logic low Since the mechanical switch...

Страница 15: ...ll turn on When the digital line is set to input it is the equivalent of a 3 3 volt connection with 100 k in series The resulting voltage across the control inputs of the relay will be close to zero a...

Страница 16: ...Hz 2 22 48 MHz default 3 23 1 MHz Divisor 4 24 4 MHz Divisor 5 25 12 MHz Divisor 6 26 48 MHz Divisor Table 2 9 2 U3 Timer Clock Base Options Note that these clocks apply to the U3 hardware revision 1...

Страница 17: ...an interrupt 61 times per second If this interrupt happens to be in progress when the edge occurs a delay of about 1 microsecond is possible If the software watchdog is enabled the system timer inter...

Страница 18: ...is 100 Hz that means the period is 10 milliseconds and thus after the command is received by the device it could be anywhere from 0 to 10 milliseconds before the start of the frequency output Frequen...

Страница 19: ...timing modes described above modes 2 3 except that hardware capture registers are used to record the edge times This limits the times to 16 bit values but is accurate to the resolution of the clock a...

Страница 20: ...e ability of these lines to sink or source current Refer to the specifications in AppendixA All digital I O on the U3 have 3 possible states input output high or output low Each bit of I O can be conf...

Страница 21: ...corner Then clockwise it goes Vbus 5 volts lower right pin 1 red wire D lower left pin 2 white wire and D upper left pin 3 green wire If you have a shield wire it can be connected to either of the lar...

Страница 22: ...FIO4 EIO7 are still available as flexible I O same as the U3 LV Revision 1 20 21 U3s cannot be upgraded to 1 30 3 Operation The following sections discuss command response mode and stream mode Comman...

Страница 23: ...the UD driver will split it like that The tables above were measured with U3 hardware version 1 21 which started shipping in late August of 2006 The times could be up to twice as long with hardware ve...

Страница 24: ...roll but the MSW be captured before it is incremented That means that only the LSW is reliable and thus you might as well just use the 16 bit modes Mode 11 the upper 32 bits of the system timer is not...

Страница 25: ...ut to all request result functions that tells the function what LabJack it is talking to The handle is obtained from the OpenLabJack function IOType This is an input to all request result functions th...

Страница 26: ...at follow are written in C To help those unfamiliar with strings in C these functions expect null terminated 8 bit ASCII strings How this translates to a particular development environment is beyond t...

Страница 27: ...eful for passing string constants in languages that cannot include the header file and is generally only used with the put get config IOTypes The strings should contain the constant name as indicated...

Страница 28: ...f information with the request to allow a generic parser to determine what should be done when the results are received Outputs None 4 2 6 Go After using AddRequest to make an internal list of request...

Страница 29: ...either function returns LJE_NO_MORE_DATA_AVAILABLE there are no more items in the list of results Items can be read more than once by calling GetFirstResult to move back to the beginning of the list U...

Страница 30: ...scription Returns Constant number of the passed string Inputs pString A pointer to the string representation of the constant Outputs None 4 2 13 ErrorToString Outputs a string describing the given err...

Страница 31: ...on the U3 Resolution Pass a nonzero value to enable QuickSample Settling Pass a nonzero value to enable LongSettling Binary If this is nonzero True the Voltage parameter will return the raw binary va...

Страница 32: ...ckBaseIndex Pass a constant to set the timer base clock The default is device specific 4 TimerClockDivisor Pass a divisor from 0 255 where 0 is a divisor of 256 aTimerModes An array where each element...

Страница 33: ...LE_PORT x1 is number of bits LJ_ioGET_ANALOG_ENABLE_PORT x1 is number of bits When a request is done with one of the port IOTypes the Channel parameter is used to specify the starting bit number and t...

Страница 34: ...t a read of AIN1 using the special 0 3 6 volt range AddRequest lngHandle LJ_ioGET_AIN_DIFF 1 0 32 0 Execute the requests GoOne lngHandle Since multiple requests were made with the same IOType and Chan...

Страница 35: ..._PORT 4 0 10 0 Set FIO3 to output high AddRequest lngHandle LJ_ioPUT_DIGITAL_BIT 3 1 0 0 Set EIO6 CIO2 5 bits starting from digital channel 14 to b10100 d20 That is EIO6 0 EIO7 0 CIO0 1 CIO1 0 and CIO...

Страница 36: ...d dblHighCycles double unsigned long dblValue 65536 dblLowCycles double unsigned long dblValue 65536 dblDutyCycle 100 dblHighCycles dblHighCycles dblLowCycles dblHighTime 0 000001 dblHighCycles dblLow...

Страница 37: ...the stream Start the stream eGet lngHandle LJ_ioSTART_STREAM 0 dblValue 0 The actual scan rate is dependent on how the desired scan rate divides into the LabJack clock The actual scan rate is returned...

Страница 38: ...RAW_OUT 0 numBytesToWrite pwriteArray Raw In This command reads the bytes from the device eGet lngHandle LJ_ioRAW_IN 0 numBytesToRead preadArray 4 3 9 Easy Functions The easy functions are simple alte...

Страница 39: ..._CLOCK_FACTOR LJ_chSPI_MOSI_PIN_NUM LJ_chSPI_MISO_PIN_NUM LJ_chSPI_CLK_PIN_NUM LJ_chSPI_CS_PIN_NUM Following is example pseudocode to configure SPI communication First configure the SPI communication...

Страница 40: ...ial protocol Using this serial protocol is considered an advanced topic A good knowledge of the protocol is recommended and a logic analyzer or oscilloscope might be needed for troubleshooting Also co...

Страница 41: ...not actually sent to the hardware until the LJ_ioSWDT_CONFIG IOType above is used LJ_chSWDT_RESET_DEVICE LJ_chSWDT_UDPATE_DIOA LJ_chSWDT_DIOA_CHANNEL LJ_chSWDT_DIOA_STATE Following is example pseudoco...

Страница 42: ...ious scan completed Scan rate is too high 61 LJE_FIRMWARE_VERSION_IOTYPE IOType not supported with this firmware 62 LJE_FIRMWARE_VERSION_CHANNEL Channel not supported with this firmware 63 LJE_FIRMWAR...

Страница 43: ...umulator 3 Divide by 28 and sum the quotient and remainder 4 Divide by 28 and sum the quotient and remainder Destination bit This bit specifies whether the command is destined for the local or remote...

Страница 44: ...Mask1 Reserved 8 LocalID 9 TimerCounterConfig Bits 4 7 TimerCounterPinOffset Bit 3 Enable Counter1 Bit 2 Enable Counter0 Bit 0 1 Number of timers enabled 10 FIOAnalog 11 FIODirection 12 FIOState 13 EI...

Страница 45: ...fies U3C and if set then bit 4 specifies HV version 5 2 3 ConfigIO Writes and reads the current IO configuration Command Byte 0 Checksum8 1 0xF8 2 0x03 3 0x0B 4 Checksum16 LSB 5 Checksum16 MSB 6 Write...

Страница 46: ...s Since this command has a flexible size byte 2 will vary For instance if a single IOType of PortStateRead d26 is passed byte 2 would be equal to 1 for the command and 3 for the response If a single I...

Страница 47: ...IN LSB MSB Analog input reading is returned justified as a 16 bit value always unsigned LabJackPython example session Automatically extracted from u3 py Debugging turned on to show the bytes sent and...

Страница 48: ...Automatically extracted from u3 py Debugging turned on to show the bytes sent and received 5 2 5 6 BitStateWrite IOType 11 BitStateWrite 2 Command Bytes 0 IOType 11 1 Bits 0 4 IO Number Bit 7 State 0...

Страница 49: ...t specifies whether to update the corresponding bit of I O State Each bit of this value corresponds to the specified bit of I O such that 1 High and 0 Low To set all low State d0 To set all 20 standar...

Страница 50: ...y Debugging turned on to show the bytes sent and received 5 2 5 15 Timer IOType 42 44 Timer 4 Command Bytes 0 IOType 42 44 1 Bit 0 UpdateReset 2 Value LSB 3 Value MSB 4 Response Bytes 0 Timer LSB 1 Ti...

Страница 51: ...e version 1 30 1 21 Command number 0x2A accesses the user memory area which consists of 512 bytes block numbers 0 15 Command number 0x2D accesses the calibration memory area consisting of 512 bytes bl...

Страница 52: ...g Command Byte 0 Checksum8 1 0xF8 2 0x00 0x01 3 0x29 0x2C 4 Checksum16 LSB 5 Checksum16 MSB 6 0x4C 7 0x6C Response Byte 0 Checksum8 1 0xF8 2 0x01 3 0x29 0x2C 4 Checksum16 LSB 5 Checksum16 MSB 6 Errorc...

Страница 53: ...15 30 for temp sensor 31 for Vreg or 193 224 for digital timer counter channels NChannel is 0 7 for FIO0 FIO7 8 15 for EIO0 EIO15 30 for Vref or 31 199 for single ended 5 2 11 StreamStart Once the str...

Страница 54: ...0 Power up the U3 with a short from FIO6 to SPC FIO2 to SCL on U3 1 20 1 21 then remove the jumper and power cycle the device again This also affects the parameters in the ConfigU3 function The watch...

Страница 55: ...ng handled manually outside of this function care must be taken to make sure SCK is initially set to CPOL before asserting CS All standard SPI modes supported A B C and D Mode A CPOL 0 CPHA 0 Mode B C...

Страница 56: ...es divided by 2 If the number of bytes is odd round up and add an extra zero to the packet NumAsynchBytesToSend Specifies how many bytes will be sent 0 56 NumAsynchBytesInRXBuffer Returns how many byt...

Страница 57: ...s the read write bit Note that the read write bit is controlled automatically by the LabJack and thus bit 0 is ignored NumI2CBytesToSend Specifies how many I C bytes will be sent 0 50 NumI2CBytesToRec...

Страница 58: ...yte Offset Description Nominal Values 0 Checksum8 0 0 3 Not Used 0x00 1 0xF8 0 4 FIO Directions 0x00 2 0x01 0 5 FIO States 0xFF 3 0x0E 0 6 FIO Analog 0x00 4 Checksum16 LSB 0 7 Not Used 0x00 5 Checksum...

Страница 59: ...formation is only needed when using low level functions and other ways of getting binary readings Readings in volts already have the calibration constants applied The UD driver for example normally re...

Страница 60: ...function to retrieve the first 8 blocks of memory This information can then be used to convert all analog input readings to voltages Again the high level Windows DLL LabJackUD does this automatically...

Страница 61: ...al LV 2 4 mV Single Ended HV 9 8 mV Special HV 19 5 mV Command Response Speed See Section 3 1 Stream Perfromance See Section 3 2 4 With DAC1 disabled on hardware version 1 30 5 This is the maximum vol...

Страница 62: ...to the U3 possible causing poor start up behavior 13 These specifications provide the answer to the question How much current can the digital I O sink or source For instance if EIO0 is configured as...

Страница 63: ...PCB Dimensions STEP U3 Enclosure Dimensions DWG U3 Enclosure Dimensions DXF U3 Enclosure Dimensions IGS U3 Enclosure Dimensions STEP U3 Enclosure Drawings zip U3 PCB Dimensions dxf U3 PCB Dimensions p...

Страница 64: ...e ack for the address will be reported Improved timer performance Changed the watchdog so that it will not clear until the host computer has read the response Fixed a problem that was causing edge32 a...

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