Omron Programmable Terminals NT31 NT31C Setup Manual page 125

Connecting to the Host's RS-422A/485 Port
Reference:
114
Connection to
Port A of a C200HX/
DM6555
*1
HG/HE(-Z)E
*2
Port 2 of a CQM1H DM6550
*1 The Communications Board's RS-422A/485 port
*1 The Serial Communications Board's RS-422A/485 port
*1 When using C200HE(-Z)E, the maximum PT unit number is 3.
For details on setting the PC Setup area settings, refer to the PC's operation
manual.
S There are no Serial Communication Boards for the C200HX/HG/HE(-Z)E in
which port B is the RS-422A/485 port.
S There are no Serial Communication Boards for the CQM1H in which port 1 is
the RS-422A/485 port.
Setting the DIP Switches on a C200HX/HG/HE(-Z)E Communication Board
Set the switches on a C200HX/HG/HE(-Z)E communication board as follows.
Switch 1: Set to 4 (4-wire type, for RS-422A), or
Set to 2 (2-wire type, for RS-485)
Switch 2 : Set to ON for terminator ON (termination resistance applied)
Setting Switches on a CQM1H Serial Communications Board
Set the switches on a CQM1H Serial Communications Board as follows.
Wire selection (WIRE): Set to 4 (4-wire type, for RS-422A)
Terminator (TERM):
Serial Communications Board
Terminator Switch (TERM)
Wire Selection Switch (WIRE)
Connecting to CS1 Series Serial Communication Board
Serial Communications Board with RS-422A/485 port equipped for CS1 series
CPU type :
CS1W-SCB41 (The port 2 is RS-422A/485 port.)
Word # Writing Value
5j00
5j00
or
Set to 2 (2-wire type, for RS-485)
Set to ON for termination ON.
(Inner Board slot 1)
Set to ON (right side)
When using RS-422A: Set to 4 (right side) for 4-wire type.
When using RS-485: Set to 2 (left side) for 2-wire type.
Section
Setting
Use NT link (1:N)
j j = highest unit number of the
g est u t u be o t e
*3 *3
connected PTs (1 to 7) ( )
5-2