Powtran PR5200 Series, Manual

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Chapter 8 RS485 communication
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Sub station
address
Function
code
Start address
low byte
Start address
low byte
Register
number high
Register
number low
CRC
check
0x01 0x08 0x00 0x80 0x00 0x0d
This agreement is not used 0 x08 function code, so the subordinate standing response:
Sub station address Function code Abnormal code CRC check
0x01 0x88 0x01
8-3-2. Illegal data address 02
Master query message format:
Sub station
address
Function
code
Start address
low byte
Start address
low byte
Register
number high
Register
number low
CRC
check
0x01 0x04 0x01 0x80 0x00 0x07
5200 04 function code register address error, so the sub station response:
Sub station address Function code Abnormal code CRC check
0x01 0x84 0x02
8-3-3.Illegal data values 03
The main inquiry message format:
Sub station
address
Function
code
Start address
low byte
Start address
low byte
Register
number high
Register
number low
CRC
check
0x01 0x04 0x00 0x80 0x01 0x80
Function code register address errors, so the child standing response:
Sub station address Function code Abnormal code CRC check
0x01 0x84 0x03
8-4.Using the matters need attention
1.Soft start device address, communication rate, calibration model must be the same with the
controller communication Settings.
2.If not receive response data, should check the above parameters, to 485 terminal connection
is correct, check CRC is correct or not.
3.When several soft starter communicate, should add 120 ohm resistor in the last soft starter's
“485+”and “485-” terminal.
4.The P5, P6, PL, PM and PN can't read and write operations through communication.