GE MOTOR MANAGEMENT RELAY 469 Instruction Manual page 179

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