Multilin SR469 - Function Code 07 - Read Device Status

SUPPORTED MODBUS FUNCTIONS 6. COMMUNICATIONS
6-10
6.3.6 FUNCTION CODE 07 - READ DEVICE STATUS
Modbus Implementation: Read Exception Status
SR469 Implementation: Read Device Status
This is a function used to quickly read the status of a selected device. A short message length allows for rapid reading of status. The
status byte returned will have individual bits set to 1 or 0 depending on the status of the slave device.
SR469 General Status Byte:
LSBit B0: R1 Trip relay operated = 1
B1: R2 Auxiliary relay operated = 1
B2: R3 Auxiliary relay operated = 1
B3: R4 Alarm relay operated = 1
B4: R5 Block Start relay operated = 1
B5: R6 Service relay operated = 1
B6: Stopped = 1
MSBit B7: Running =1
Note:
if status is neither stopped or running, motor is starting.
Message Format and Example:
Request status from slave 11.
Master Transmission Bytes Example (hex)
SLAVE ADDRESS 1 0B message for slave 11
FUNCTION CODE 1 07 read device status
CRC 2 47 CRC calculated by the master
42
Slave Response
SLAVE ADDRESS 1 0B message for slave 11
FUNCTION CODE 1 07 read device status
DEVICE STATUS 1 59 status = 01011001 in binary
CRC 2 C2 CRC calculated by the slave
08