6-6 469 Motor Management Relay GE Power Management
6.2 SUPPORTED MODBUS FUNCTIONS 6 COMMUNICATIONS
6
d) MESSAGE FORMAT AND EXAMPLE, FUNCTION 02
Example 1: Request slave 11 to respond with status of digital inputs 5 to 9:
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 Closed
D9: Assignable Input 4 Closed
Bit Mask (LSB) 0111 0001
Bit Mask (MSB) 0000 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 05 starting at digital input 5
NUMBER OF DIGITAL INPUTS 2 00 05 5 digital inputs (i.e. D5, D6, D7, D8, D9)
CRC 2 A8 A2 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 02 2 byte bit mask
BIT MASK 2 71 01 bit mask of requested digital input
CRC 2 C5 B9 CRC calculated by the slave
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