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178 HVAC Drive H300
Issue Number: 3
Table 10-13 Master request
Table 10-14 Slave response
FC23 Read/Write multiple
Writes and reads two contiguous arrays of registers. The slave imposes an upper limit on the number of registers which can be written. If this is
exceeded the slave will discard the request and the master will time out.
Table 10-15 Master request
Table 10-16 Slave response
s
Byte Description
0 Slave node address 1 through 247, 0 is global (broadcast)
1 Function code 0x10
2 Start register address MSB
3 Start register address LSB
4 Number of 16 bit registers MSB
5 Number of 16 bit registers LSB
6 Length of register data to write (in bytes)
7 Register data 0 MSB
8 Register data 0 LSB
7+byte count CRC LSB
8+byte count CRC MSB
Byte Description
0 Slave source node address
1 Function code 0x10
2 Start register address MSB
3 Start register address LSB
4 Number of 16 bit registers written MSB
5 Number of 16 bit registers written LSB
6CRC LSB
7CRC MSB
Byte Description
0 Slave node address 1 through 247, 0 is global (broadcast)
1 Function code 0x17
2 Start register address to read MSB
3 Start register address to read LSB
4 Number of 16 bit registers to read MSB
5 Number of 16 bit registers to read LSB
6 Start register address to write MSB
7 Start register address to write LSB
8 Number of 16 bit registers to write MSB
9 Number of 16 bit registers to write LSB
10 Length of register data to write (in bytes)
11 Register data 0 MSB
12 Register data 0 LSB
11+byte count CRC LSB
12+byte count CRC MSB
Byte Description
0 Slave source node address
1 Function code 0x17
2 Length of register data in read block (in bytes)
3 Register data 0 MSB
4 Register data 0 LSB
3+byte count CRC LSB
4+byte count CRC MSB
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