6.4.8.7
FC 08 - Loop Back Diagnostic Test
This function serves to check the communications connection. It does not effect the user
program. The received message is independently returned to the master by the driver.
Request message
ADDR
FUNC
diagnostic_code
(High, Low)
test_data
CRC
Reply message
ADDR
FUNC
diagnostic_code
(High, Low)
test_data
CRC
Only
diagnostic_code
= 0000 is supported by the driver.
Any 16bit value.
diagnostic_code
test_data
VIPA System 300S
Communication protocols
Modbus > Modbus Slave - Function codes
HB130 | CP | 341-1CH01 | en | 18-40
88