Emerson Unidrive M400 Series User Manual page 64

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Table 8-2 Master request
Byte
Slave destination node address 1 through 247, 0 is
0
global
1 Function code 0x03
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 CRC LSB
7 CRC MSB
Table 8-3 Slave response
Byte
0 Slave source node address
1 Function code 0x03
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
FC06 Write single register
Writes a value to a single 16 bit register. The normal response is an echo
of the request, returned after the register contents have been written.
The register address can correspond to a 32 bit parameter but only 16
bits of data can be sent.
Table 8-4 Master request
Byte
0 Slave node address 1 through 247, 0 is global
1 Function code 0x06
2 Register address MSB
3 Register address LSB
4 Register data MSB
5 Register data LSB
6 CRC LSB
7 CRC MSB
Table 8-5 Slave response
Byte
0 Slave source node address
1 Function code 0x06
2 Register address MSB
3 Register address LSB
4 Register data MSB
5 Register data LSB
6 CRC LSB
7 CRC MSB
FC16 Write multiple
Writes a contiguous array 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.
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Table 8-6 Master request
Byte
0 Slave node address 1 through 247, 0 is global
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
Table 8-7 Slave response
Byte
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
6 CRC LSB
7 CRC MSB
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 8-8 Master request
Byte
0 Slave node address 1 through 247, 0 is global
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
Table 8-9 Slave response
Byte
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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Unidrive M400 Control User Guide
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