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Connecting to a CJ-series Serial Communications Unit
CJ-series Rack-mounted Serial Communications Unit: CJ1W-SCU41-V1
(Port 1 is an RS-422A/ 485 port.)
Setting the Front-panel Switches
Set the unit number for the Serial Communications Unit using the rotary switch on the front
panel of the Unit. Use a flat-head screwdriver to set the unit number in the setting display
window.
Set the terminator switch to ON (right side).
Set the 2-wire/4-wire selection switch to 4 (right side).
•
Terminator Switch (TERM)
Set to ON (right side).
•
Unit Number Setting
Set a number between 0 and F. Do not
set a number used by another Unit.
•
2-wire/4-wire Selection Switch
(WIRE)
Set to 4 (right side).
•
Port 1
RS-422A/485
Setting Parameters Allocated in the DM Area in the CPU Unit
Settings can be directly written to the words allocated to the Serial Communications Unit in
the DM Area (System Setup Area) by using a Programming Device, such as a Programming
Console or the CX-Programmer. Any changes to the settings can be enabled by cycling the
power supply, restarting the Unit, restarting the communications port, or executing a STUP
instruction.
The following table lists the words allocated in the DM Area and setting details.
M = 100
×
unit number (word address)
Allocation DM Area word
Port 1
Port 2
Write value
Setting details
m M+10
8000
Host Link mode, 2 stop bits, even parity,
7-bit data
0000
Baud rate: 9,600 bps
M+1 M+11
0007
Baud rate: 19,200 bps
M+2
M+12
0000
Transmission delay time: 0 s
M+3
M+13
0000
No CTS control, unit number 0 for Host
Link