GE 469 Communications Manual

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10 469 MOTOR MANAGEMENT RELAY – COMMUNICATIONS GUIDEMODBUS FUNCTIONS COMMUNICATIONS GUIDEMESSAGE FORMAT AND EXAMPLE:Request status from slave 11.Loopback TestModbus Implementation: Loopback Test469 Implementation: Loopback TestThis function is used to test the integrity of the communication link. The 469 will echo therequest.MESSAGE FORMAT AND EXAMPLE:Loopback test from slave 11.Store Multiple SetpointsModbus Implementation: Preset Multiple Registers469 Implementation: Store Multiple SetpointsThis function code allows multiple setpoints to be stored into the 469 memory. Modbus“registers” are 16-bit (two byte) values transmitted high order byte first. Thus all 469setpoints are sent as two byte values. The maximum number of setpoints that can bestored in one transmission is dependent on the slave device. Modbus allows up to amaximum of 60 holding registers to be stored. The 469 response to this function code is toecho the slave address, function code, starting address, the number of Setpoints stored,and the CRC.Master Transmission Bytes Example DescriptionSlave Address 1 0B message for slave 11Function Code 1 07 read device statusCRC (low, high) 2 47 42 computed CRC error codeSlave Response Bytes Example DescriptionSlave Address 1 0B message from slave 11Function Code 1 07 read device statusDevice Status 1 59 status = 01011001bCRC (low, high) 2 C2 08 computed CRC error codeMaster Transmission Bytes Example DescriptionSlave Address 1 0B message for slave 11Function Code 1 08 loopback testDiagnostic Code 2 00 00 must be 00 00Data 2 00 00 must be 00 00CRC (low, high) 2 E0 A1 computed CRC error codeSlave Response Bytes Example DescriptionSlave Address 1 0B message from slave 11Function Code 1 08 loopback testDiagnostic Code 2 00 00 must be 00 00Data 2 00 00 must be 00 00CRC (low, high) 2 E0 A1 computed CRC error code