Table 22. Rs-422 Reception Packet Structure; Table 23. Protocol Packet Code Description - Parker P Series User Manual

 Reception Packet Structure
Additional
Address
Byte
description Node ID
Additional
Address
Byte 0
descripti
Node ID
on

Table 22. RS-422 Reception Packet Structure

 Protocol Packet Code Descriptions
 Node ID
This indicates the Node ID of the servo driver to transmit.
The Node ID of servo Drive can be configured with the external switch at the loader
window. The set Node ID can be viewed at parameter [0x2003].
 Function Code
Function Codes under Modbus-RTU Standard supported by PD Drive are as follows.
Category
PUBLIC Function
Code

Table 23. Protocol Packet Code Description

 Data
[Transmission] : In the case of Read Register command, Modbus address, number
of registers, and number of bytes, etc. are designated. In case of Write Register
command, Modbus address, number of bytes, and value to set, etc. are designated.
[Reception] : In the case of Read Register command, under normal response, Node
ID and Function Code are received as the same values as the transmitted values. The
value of each register is received in the order they were transmitted.
In the case of Write Single Register command, the same values as the transmitted
values are received. In the case of Write Multi Register, the starting address intended
to write the data in with the same values as the transmitted values and the number of
registers are received.
Parker Hannifin
[Normal Response]
Function
Code
0 1
Function Data
[Abnormal Response]
Functio
n Code
1
Function+
0x80
Comm
and Descriptions
Code
0x03 Read Holding Registers
0x04 Read Input Register
0x06 Write Single Register
0x10 Write Multi Register
Data
2 . .
. .
Data
2
Exception code
Error Check
n-1 n
CRC(MSB) CRC(LSB)
Error Check
3 4
CRC(MSB) CRC(LSB)
Usage
Read Write
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P series User Guide 65