GE Power Management 469 Motor Management Relay 6-7
6 COMMUNICATIONS 6.2 SUPPORTED MODBUS FUNCTIONS
6
Example 2: Request slave 11 to respond with status of digital inputs 1 to 4:
Digital Input Status
D1: Access Closed
D2: Test Open
D3: Starter Status Open
D4: Emergency Restart Open
D5: Remote Reset Closed
D6: Assignable Input 1 Closed
D7: Assignable Input 2 Closed
D8: Assignable Input 3 Open
D9: Assignable Input 4 Closed
Bit Mask (LSB) 0111 0001
MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION
SLAVE ADDRESS 1 0B message for slave 11
FUNCTION CODE 1 02 read digital input status
STARTING DIGITAL INPUT 2 00 01 starting at digital input 1
NUMBER OF DIGITAL INPUTS 2 00 04 4 digital inputs (i.e. D1, D2, D3, D4)
CRC 2 28 A3 CRC calculated by the master
SLAVE RESPONSE: BYTES EXAMPLE / DESCRIPTION
SLAVE ADDRESS 1 0B response message from slave 11
FUNCTION CODE 1 02 read relay coil status
BYTE COUNT 1 01 2 byte bit mask
BIT MASK 2 01 bit mask of requested digital input
CRC 2 63 90 CRC calculated by the slave
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