KTI Networks KSC-240 Installation Manual Download Page 36 | Manualshive

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3.3 RS-485 Multi-drop Network

This topology is similar to RS-422 multi-drop. However, up to 32 receiv-
ers are permitted under RS-485. This may be used for point-to-multipoint
communications.

The converter can convert an RS-232 device into a

Master

node in this

multi-drop network as illustrated below:

The configuration for MASTER node is:

SW1-4

TXE

Enable Driver always

SW1-6

RXC

Enable Receiver RTS/ADC Control

SW1-5

RTS-D

Disable RTS control

SW2-1

SDD

Disable ADC control

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Summary of Contents for KSC-240

Page 1: ... 1 Industrial RS 232 to RS 485 422 Converter KSC 240 InstallationGuide DOC 070412 KSC 240 ...

Page 2: ...erves the right to revise this documentation and to make changes in content from time to time without obligation on the part of KTI Networks Inc to provide notification of such revision or change For more information contact United States KTI Networks Inc P O BOX631008 Houston Texas 77263 1008 Phone 713 2663891 Fax 713 2663893 E mail kti ktinet com URL http www ktinet com International Fax 886 2 2...

Page 3: ...ice must accept any interference received including the interference that may cause CE NOTICE Marking by the symbol indicates compliance of this equipment to the EMC directive of the European Community Such marking is indica tive that this equipment meets or exceeds the following technical stan dards EMC Class B EN 50081 1 1992 EN55022 1994 A1 1995 A2 1997 Class B EN61000 3 2 2000 EN61000 3 3 1995...

Page 4: ...1 RS 485 422 Driver and Receiver Control 28 2 8 Making Serial RS 232 Connection 29 2 8 1 Cable for Connection to PC COM Port 31 3 Making RS 485 422 Connection 32 3 1 RS 422 Point to Point Circuit 33 3 2 RS 422 Multi drop Network 34 3 3 RS 485 Multi drop Network 36 3 4 RS 485 Half duplex 2 wire Network 38 3 5 RS 485 Full duplex 4 wire Network 39 3 6 Summary of the Converter Applications 41 4 LED In...

Page 5: ...r industrial cabinets and enclosures Further more designs such as signal protec tion wide operating temperature range wide power voltage range are provided to suit for more industrial applications For industrial environment the converters are designed with the follow ing enhanced features exceeding that of commercial media converters High and wide operating Temperature Wide operating voltage range...

Page 6: ...e RS 485 network Supports full duplex or half duplex for RS 485 422 interface Provides remote RTS control for RS 485 transmission ProvidesADC TM AutoData Control for RS 485 transmission Designed for industrial environments with Surge ESD and isolation protection DIN rail and panel mounting support Wide power voltage range support Terminal block and Jack type power connectors Wide operating tempera...

Page 7: ... 7 1 2 Specifications This figure shows the important components of the device ...

Page 8: ...5 422 interface RS 485 422 Interface Connector Screw type terminal block Signal Type Balanced differential lines Data Speed 115Kbps Standard EIA 485 EIA 422 High ESDTolerance 15KV on driver and receiver lines Overvoltage Protection Cutoff if over 28V LEDIndicators LED DISPLAY STATE INTERPRETATION PWR Power status ON Power on OFF Power off 232TX RS 232TX BLINK RS 232TXActivity 232RX RS 232RX BLINK ...

Page 9: ...S 485 422 receiver enable control by RTS or ADC RXE On RS 485 422 receiver is forced to enable SW1 8 7 BIAS D Off RS 485 422 line bias is disabled BIAS E On RS 485 422 line bias is enabled SW2 1 SDD Off Disable ADC control for RS 485 422 TX RX SDE On Enable ADC control for RS 485 422 TX RX SW2 2 1200 On ADC Timing parameter for RS 232 baud 1200 SW2 3 2400 On ADC Timing parameter for RS 232 baud 24...

Page 10: ...C 30VDCinput BasicInformation Conversion RS 232 RX data to RS 485 422 TX data RS 485 422 RX data to RS 232 TX data Optical Isolation Isolated between RS 232 and RS 485 422 3000VDCrms Mechanical Dimension base W28mmxD82mmxH95mm Housing Enclosed metal with no fan Mounting Support DIN rail mounting Panel mounting Weight 240g Environmental Operating Temperature 20o C 70o C Storage Temperature 20o C 85...

Page 11: ... EN55022 1994 A1 1995 A2 1997 EN61000 3 2 2000 EN61000 3 3 1995 A1 2001 EN 55024 1998 A1 2001 IEC 61000 4 2 1995 ESD Test IEC 61000 4 3 1995 RS Test IEC 61000 4 4 1995 EFT BURST Test IEC 61000 4 5 1995 Surge Test IEC 61000 4 6 1996 CS Test IEC 61000 4 8 1993 Magnetic Field IEC 61000 4 11 1994 Volatge Int Dips ...

Page 12: ...t your local reseller for replacement The following are available optional accessories Panel Mounting Bracket The bracket is used for mounting the device on a panel surface Commercial ratedAC power adapters RatedAC120V 60HzDC7 5V1A RatedAC230V 50HzDC7 5V1A RatedAC100V 50 60HzDC7 5V1A RatedAC240V 50HzDC7 5V1A The adapters are used for supplying DC power to the converter via DC power jack interface ...

Page 13: ... replace the part or contact your trained service provider The power cable extension cable or plug is damaged An object has fallen into the product The product has been exposed to water The product has been dropped or damaged The product does not operate correctly when you follow the operating instructions Do not push any objects into the openings of your system Doing so can cause fire or electric...

Page 14: ...N rail are 1 Install the mounting bracket onto the device unit as shown below 2 Attach bracket to the lower edge of the DIN rail and push the unit upward a little bit until the bracket can clamp on the upper edge of the DIN rail 3 Clamp the unit to the DIN rail and make sure it is mounted securely 4 Make sure that there are proper heat dissipation from and adequate ventilation around the device ...

Page 15: ... 15 The final mechanical dimensions after installingDINrail mounting bracket are ...

Page 16: ...device on a plane surface securely The mounting steps are 1 Install the mounting bracket on the device unit 2 Screw the bracket on the device unit 3 Screw the device unit on a panel 4 Make sure that there are proper heat dissipation from and adequate ventilation around the device Do not place heavy objects on the device ...

Page 17: ... 17 The screw locations and final dimension are shown below ...

Page 18: ...y UsingTerminal Blocks Either DC1 interface or DC2 interface can be used to receive DC power from an external power system Or DC2 also can be used to deliver the power received on DC1 to next device in cascading way DC1 Vdc Positive terminal DC1 Vdc Negative terminal DC2 Vdc Positive terminal DC2 Vdc Negative terminal Three 2Pterminal plugs are provided together with the device Two of the three pl...

Page 19: ...perly Screw the wire with plug securely Then plug in DC1 contacts If cascading the power to next device is needed install the power wires and plug for another switch Then use DC2 contacts Note Only up to four device units can be cascaded to receive power from one main power input source ...

Page 20: ...0HzDC7 5V1A RatedAC240V 50HzDC7 5V1A Connect power adapter DC plug to the DC power jack of the converter before connecting to the AC outlet Connect the power adapter to the AC outlet Note Before you begin the installation check the AC voltage of your area The AC power adapter which is used to supply the DC power for the unit should have the AC voltage matching the commercial power voltage in your ...

Page 21: ...ts labeled PF and PF in the terminal block interface Use the provided 2Pterminal plug for signal wiring and plug into the PF contacts The function is designed as Power is normal PF contact is shorted with PF contact Power failure PF contact is disconnected with PF contact Note Be sure the voltage applied on PF contacts is within the specification of 30VDC 1A max or 120VAC 0 5A max ...

Page 22: ...ire RS 485 422 driver receiver connected 2W setting activates the internal connection between driver and re ceiver in RS 485 422 interface It simplifies the installation of the con verter in a 2 wire bus RS 422 usually uses 2 wire topology only RS 485 supports both 2 wire and 4 wire topology ...

Page 23: ...a bus topology or multi drop network The terminator is a resistor added in parallel with the receiver s A and B lines in order to match the data line characteristic impedance and reduce signal reflection This setting is useful when the converter is installed at the end of a RS 485 or RS 422 bus If the internal 120 Ohm terminator is not appropriate for your application use T D to disable it and use...

Page 24: ...ing enables RS 485 422 driver to be controlled by RTS method orADC method RTS method is described later Refer to SW2 settings for more description aboutADC method TXE setting forces RS 485 422 driver to be enabled always This setting is applied when Master function is required in an RS 485 RS 422 multi drop bus ...

Page 25: ...e RS 485 422 driver RTS D setting is used to disable RTS control method SW1 6 RXC RS 485 422 receiver enable control by RTS orADC RXE RS 485 422 receiver is forced to enable RXC setting enable to use the same TXC logic but reverse it as RXC for the RS 485 422 receiver control It means when the driver is enabled the receiver is disabled The receiver is enabled when the driver is dis abled This sett...

Page 26: ...ors on the data B line and pull down resistors to ground on dataAline In 4 wire configuration the bias resistors are placed on the receiver lines BIAS D disables the internal BIAS resistors on receiver lines BIAS E setting enables internal bias resistors The bias configuration can support up to 30 receiver nodes with no terminators If the bias configuration is not proper for your physical topology...

Page 27: ...a useful method for driver control since it needs no software involved In order to obtain an optimal performance set SW2 2 SW2 8 the asso ciated timing parameter for each RS 232 baud rate SW2 2 1200 ADC Timing parameter for RS 232 baud 1200 SW2 3 2400 ADC Timing parameter for RS 232 baud 2400 SW2 4 4800 ADC Timing parameter for RS 232 baud 4800 SW2 5 9600 ADC Timing parameter for RS 232 baud 9600 ...

Page 28: ...bled Receiver is disabled TXE RXE Driver is enabled Receiver is enabled TXC RXE RTS D SDD Driver is disabled Receiver is enabled TXC RXE RTS E SDD Driver controlled by RTS Receiver is enabled TXC RXC RTS E SDD Driver controlled by RTS Receiver is enabled when driver is disabled TXC RXE RTS D SDE Driver controlled byADC Receiver is enabled TXC RXC RTS D SDE Driver controlled byADC Receiver is enabl...

Page 29: ...erfaceDCE PinAssignment Table Pin Signal Name Input Output 1 Received Line Signal Detect Output 2 TX Data Output 3 RX Data Input 4 DTE Ready Input 5 Signal Ground Output 6 DCE Ready Output 7 Clear To Send Input 8 Request To Send Output 9 Ring Indicator Output ...

Page 30: ...ween an RS 232 device and RS 485 or RS 422 bus The connection is illustrated as fol lows The following signals received on the RS 232 interface are converted to RS 485 bus signals Pin SignalName Input Output 2 TXData Output 3 RXData Input 7 Clear To Send Input ...

Page 31: ... 31 2 8 1 Cable for Connection to PC COM Port Connecting to 9 pinDTE device Computer or PC COM Connecting to 25 pinDTE device Computer or PC COM ...

Page 32: ...blished TIA EIA485 and RS 422 standards define only the electri cal characteristics of the drivers and receivers as listed below They did not standardize such things such as cables and connectors pinouts bus arbitration signaling protocols or physical wiring topology Many dif ferent implementations have come into use and they are often incompat ible with each other Characteristics RS 422 RS 485 Mo...

Page 33: ...s the simplest configuration just one driver and one receiver If termination is used it is only required at the receiver Most RS 422 cables used to connect telecom or data com equipment are point to point links The converter can convert an RS 232 device into a Driver node in this point to point circuit The configuration is SW1 4 TXE EnableDriver always SW1 6 RXC Enable Receiver RTS ADC Control SW1...

Page 34: ...eiver always SW1 5 RTS D Disable RTS control SW2 1 SDD DisableADC control 3 2 RS 422 Multi drop Network In this topology there is only one driver sending to one or more receiv ers One termination resistor is recommended at the extreme end of the bus to eliminate reflections Up to 10 receivers are permitted under RS 422 Multiple receive only nodes may be used for point to multipoint communications ...

Page 35: ... SW1 6 RXC Enable Receiver RTS ADC Control SW1 5 RTS D Disable RTS control SW2 1 SDD DisableADC control It also can convert an RS 232 device into a SLAVE node in this multi drop network The configuration for a SLAVE node is SW1 4 TXC Enable RTS ADC Control forDriver SW1 6 RXE Enable Receiver always SW1 5 RTS D Disable RTS control SW2 1 SDD DisableADC control ...

Page 36: ... This may be used for point to multipoint communications The converter can convert an RS 232 device into a Master node in this multi drop network as illustrated below The configuration for MASTER node is SW1 4 TXE EnableDriver always SW1 6 RXC Enable Receiver RTS ADC Control SW1 5 RTS D Disable RTS control SW2 1 SDD DisableADC control ...

Page 37: ... RS 232 device into a SLAVE node in this multi drop network The configuration for a SLAVE node is SW1 4 TXC Enable RTS ADC Control forDriver SW1 6 RXE Enable Receiver always SW1 5 RTS D Disable RTS control SW2 1 SDD DisableADC control ...

Page 38: ...tances at low to medium data rates all on a single pair of wires 2 wire It can implement a very functional very flexible and very economical data network Because signals travel in both directions this bus should be terminated at both ends to prevent reflections Only one node can drive the bus at a time making this a half duplex communication channel Only one driver should be active at any one time...

Page 39: ...Use RTS control optional SW2 1 SDE UseADC control optional SW2 2 8 Baud Baud whenADC control is enabled optional SW1 3 T D Disable internal terminator optional 3 5 RS 485 Full duplex 4 wire Network The 4 wire network simplifies bus arbitration in multi node RS 485 A single Master node is the only driver allowed on the top most wire pair All other nodes listen to all data traffic that passes on the...

Page 40: ...W1 4 TXE EnableDriver always SW1 6 RXC Enable RTS ADC Control for Receiver SW1 5 RTS E Use RTS control optional SW2 1 SDE Or useADC control optional SW2 2 8 Baud Baud when ADC control is enabled optional SW1 3 T D Disable internal terminator optional To convert an RS 232 device into a Slave node in RS 485 4 wire network the configuration is SW1 2 1 4W Select 4 wire topology SW1 4 TXC Enable RTS AD...

Page 41: ...ire circuit 2 RS 422 2 wire multi drop network 3 RS 485 2 wire multi drop network 4 RS 485 half duplex bidirectional network in 2 wire topology 5 RS 485 full duplex bidirectional network in 4 wire topology The converter is equipped with functionality and flexibility to convert an RS 232 device to a node in any one of the above topologies ...

Page 42: ...PRETATION PWR Power status ON The device is powered on OFF The device is powered off 232TX RS 232TX ON RS 232 TX data is present OFF No RS 232 TX data 232RX RS 232RX ON RS 232 RX data is present OFF No RS 232 RX data TXC RS 485 ON The driver is enabled Driver Enable OFF The driver is disabled and is in tri state high impedance ...

Page 43: ... control for RS 485 422 driver SW1 6 RXC Off RS 485 422receiverenablecontrolbyRTSorADC SW1 8 7 BIAS D Off Disable RS 485 422 line bias SW2 1 SDE On EnableADC control for RS 485 422 driver SW2 2 Off DisableADCTiming for RS 232 baud 1200 SW2 3 Off DisableADCTiming for RS 232 baud 2400 SW2 4 Off DisableADCTiming for RS 232 baud 4800 SW2 5 9600 On SelectADCTiming for RS 232 baud 9600 SW2 6 Off Disable...

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