Function Code 08: Loopback Test - GE MOTOR MANAGEMENT RELAY 469 Instruction Manual

6.2 SUPPORTED MODBUS FUNCTIONS
Modbus Implementation:
469 Implementation:
This function is used to test the integrity of the communication link. The 469 will echo the request.
MESSAGE FORMAT AND EXAMPLE
Loopback test from slave 11.
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
DIAG CODE
DATA
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
DIAG CODE
DATA
CRC
6
6-12
Loopback Test
Loopback Test
BYTES EXAMPLE / DESCRIPTION
1 0B
1 08
2 00 00
2 00 00
2 E0 A1
BYTES EXAMPLE / DESCRIPTION
1 0B
1 08
2 00 00
2 00 00
2 E0 A1
469 Motor Management Relay
6 COMMUNICATIONS

6.2.7 FUNCTION CODE 08: LOOPBACK TEST

message for slave 11
loopback test
must be 00 00
must be 00 00
CRC calculated by the master
response message from slave 11
loopback test
must be 00 00
must be 00 00
CRC calculated by the slave
GE Power Management