Omron NX1P2 series

3 Configuration Units
3 - 24
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
All pins are turned OFF by default.
Use a narrow-tipped tool such as a flat-blade screwdriver to change the settings of the DIP switches.
 RS-422A/485 Terminal Block
CIF11 CIF12
Setting
SW No. SW No.
SW1 1 SW1 1 ON Terminating
resistance pro-
vided
Select whether a terminating resistance
is provided or not. The value of a termi-
nating resistance is approximately 220
.
OFF Terminating
resistance not
provided
2 2 ON Two-wire type Select the two-wire or four-wire type.
To set the two-wire type, turn ON both
No. 2 and No. 3 pins. To set the four-wire
type, turn OFF both No. 2 and No. 3
pins.
OFF Four-wire type
3 3 ON Two-wire type
OFF Four-wire type
4 4 --- --- Not used.
5SW21 ONRS control
enabled
Select whether to enable the RS control
for receive data.
To prohibit the echo back, enable the RS
control (ON).
OFF RS control dis-
abled
(continuous
reception)
6 2 ON RS control
enabled
Select whether to enable the RS control
for send data.
For a four-wire, 1-to-N connection,
enable the RS control (ON) if you con-
nect the Unit to a device on the N side.
For a two-wire connection, always
enable the RS control (ON).
OFF RS control dis-
abled
(continuous
transmission)
Abbrevia-
tion
Four-wire type selected Two-wire type selected
Signal name I/O Signal name I/O
RDA- Reception data

Input Communication
data 
I/O
*1
*1. For two-wire connection, either the RDA-/RDB+ pair or SDA-/SDB+ pair can be used.
RDB+ Reception data
+
Communication
data +
SDA- Transmission
data 
Output Communication
data 
I/O
*1
SDB+ Transmission
data +
Communication
data +
SHLD Shield
RDA- RDB+ SDA- SDB+ SHLD