GE 469 Manual page 174

6.2 SUPPORTED MODBUS FUNCTIONS
d) MESSAGE FORMAT AND EXAMPLE, FUNCTION 02
Example 1: Request slave 11 to respond with status of digital inputs 5 to 9:
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)
Bit Mask (MSB)
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
STARTING DIGITAL INPUT
NUMBER OF DIGITAL INPUTS
CRC
6
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
BYTE COUNT
BIT MASK
CRC
6-6
Status
Closed
Open
Open
Open
Closed
Closed
Closed
Closed
Closed
0111 0001
0000 0001
BYTES EXAMPLE / DESCRIPTION
1 0B
1 02
2 00 05
2 00 05
2 A8 A2
BYTES EXAMPLE / DESCRIPTION
1 0B
1 02
1 02
2 71 01
2 C5 B9
469 Motor Management Relay
6 COMMUNICATIONS
message for slave 11
read digital input status
starting at digital input 5
5 digital inputs (i.e. D5, D6, D7, D8, D9)
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
GE Power Management