Nidec H300 - FC03 Read Multiple; FC06 Write Single Register; FC16 Write Multiple; Slave Response

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HVAC Drive H300 177

Issue Number: 3

The following function codes are supported:

FC03 Read multiple

Read a contiguous array of registers. The slave imposes an upper limit on the number of registers, which can be read. If this is exceeded the slave

will issue an exception code 2.

Table 10-9 Master request

Table 10-10 Slave response

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

Table 10-11 Master request

Table 10-12 Slave response

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.

Code Description

3 Read multiple 16 bit registers

6 Write single register

16 Write multiple 16 bit registers

23 Read and write multiple 16 bit registers

Byte Description

0 Slave destination node address 1 through 247, 0 is global (broadcast)

1 Function code 0x03

2 Start register address MSB

3 Start register address LSB

4 Number of 16 bit registers MSB