Schneider Electric VW3 A3 303 RS485 schematic for the card, Card connector pinout, Sub-D

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Schematic diagram:

9. Appendix

9. 7. RS485 schematic for the card

The RS485 interface on the Modbus card is electricallyisolated from the drive.

Polarization switch

Female

9-way

Pull-up polarization resistor

SUB-D

Pull-down polarization resistor

Enable

Polarization switch

The polarization switches are used to connect or disconnect the pull-up and pull-down resistors, which implement either Modbus (no slave polarization) or Uni-Telway (4.7 kΩ polarization for each station) type polarization.

9. 8. Card connector pinout

Contact no. Signal

1Reserved

2RXD0 = RD(A)

3D0 = A/A’ = D(A)

4Common = C/C’ = 0VL

5RxD1 = RD(B)

6RxD1 = RD(B)

7D1 = B/B’ = D(B)

8Not connected

9Not connected

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Contents Altivar Contents Before you begin Electric shock will result in death or serious injuryProgramming Manual Installation ManualDocumentation structure Communication Parameters ManualPresentation IntroductionNotation Receipt Hardware setupInstalling the card in the drive Hardware descriptionChoosing polarization Switch codingCoding the address Address 1234Wiring recommendations Connecting to the busModbus RS485 standard Connection accessories Connection via RJ45 wiring systemConnection cables TWD XCA RJ030 Connection cables for the masterType of master Master interface Description Catalog number TSX SCP CMRS485 double shielded twisted pair Connection via junction boxesDescription Catalog Number Subscriber socket CablesTSX CSA500 TSX P ACCConfiguration Communication parametersControl via Modbus or the terminals in I/O profile Control CommandControl via Modbus in I/O profile Parameter Value CommentControl via Modbus in Drivecom profile Control via Modbus or the terminals in Drivecom profileConfiguration RDY NET Example of configuration via the graphic display terminalCommunication scanner COM. Scanner InputCommunication faults COM. Fault ManagementFormat CONFIG. COMM. MAPMonitored parameters Format Range Terminal displayLEDs DiagnosticsChecking the address Green RUN Red ERR Meaning Corrective actionCOM. Scanner Input MAP RUN NETCommunication MAP COM Scan Output MAP CMD. Word ImageOutput variable Scanner parameter Input variable Scanner parameterCOM Scan Output MAP Communication fault Card faultPrinciple Modbus protocolSlave Slave j Slave k Modes RTU modeAscii mode Slave address Function code DataRead Holding/Input Registers 3/4 Modbus functions availableCode Modbus name Description Broadcast Size of data Write Single Register Diagnostics Get Comm Event Counter 11 = 16#0B Write Multiple Registers 16 = 16#10Read/Write Multiple Registers 23 = 16#17 Read Device Identification 43 = 16#2B MachineExample of positive response MEIInput variables Logic address Default assignment Output variables Logic address Default assignmentCode Modbus name Description Size of data Parameter Logic Read Input variable address Logic address Default valueParameter Logic Input monitoring Output controlParameter assigned Value Parameter assignedException responses Code Error codeResponse Read non-existent or protected parameters Logic address Parameter ValueAppendix RS485 standardModbus 2-wire standard schematic MasterModbus 4-wire standard schematic Uni-Telway schematic Wire Jbus schematic Type of trunk cable Cable with 1 shielded twisted pairDifferent scenarios Creating a Modbus bus using non-standard equipmentRecommendations Calculating the polarization ExampleContact no. Signal RS485 schematic for the cardCard connector pinout SUB-DAtv71ModbusJbusENV1 2005-05