Multilin SR469 - Function Code 08 - Loopback Test

6. COMMUNICATIONS SUPPORTED MODBUS FUNCTIONS
6-11
6.3.7 FUNCTION CODE 08 - LOOPBACK TEST
Modbus Implementation: Loopback Test
SR469 Implementation: Loopback Test
This function is used to test the integrity of the communication link. The SR469 will echo the request.
Message Format and Example:
Loopback test from slave 11.
Master Transmission Bytes Example (hex)
SLAVE ADDRESS 1 0B message for slave 11
FUNCTION CODE 1 08 loopback test
DIAG CODE 2 00 must be 00 00
00
DATA 2 00 must be 00 00
00
CRC 2 E0 CRC calculated by the master
A1
Slave Response
SLAVE ADDRESS 1 0B message from slave 11
FUNCTION CODE 1 08 loopback test
DIAG CODE 2 00 must be 00 00
00
DATA 2 00 must be 00 00
00
CRC 2 E0 CRC calculated by the slave
A1