Setup The 87Pn System Parameter; Communication Parameters Of 87Pn Cpu Module; Fig.11：Setup The Address Of Rotary Switch On 87P4 Cpu Module - ICP DAS USA RU-87P1 User Manual

2.2 Setup the 87Pn system parameter:

2.2.1 Communication parameters of 87Pn CPU module:

The 87Pns setup its Address, Baud rate and Checksum by adjusting the DIP switch and
Rotary Switch which on 87Pn CPU module. It's not setup by software, please setup the
communication condition at first and don't change the communication condition under
operating mode.
Step1.
Adjusting the Rotary Switch as following diagram,
hexadecimal code, divided into High byte and low byte two groups.
Ex: The high byte turns to 0, the low byte turns to
16x0+1=1；
Ex: The high byte turns to 1, the low byte turns to
16x1+0=16.
Fig.11：Setup the address of Rotary Switch on 87P4 CPU module
Note: If you change the address to 00, no matter where is the actual position of DIP
switch, the system parameter will return to
Checksum off, Baud rate 115200)
Step2.
Setup the DIP switch as following description：
RU-87P1/2/4/8 User Manual, Version: 1.2
Address is set to the
1 then the address of RS-485 is
0 then the address of RS-485 is
default value! (Auto config. On,
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