Omron CP1H CPU Operation Manual page 729

Connections to Serial Communications Option Boards
(2) The terminating resistant setting shown above is an example for the NT631/NT631C. The setting
method varies with the PT. Refer to the manual for you PT for details.
Connections for Serial Gateway and No-protocol Communications
This section describes the connections for Serial Gateway, and no-protocol communications. Up to 32 nodes
can be used for 1:N connections.
Port Configu-
ration
RS-232C 1:1
RS-232C 1:N
Note (1) The maximum cable length for RS-232C is 15 m. The RS-232C standard, however, does not cover
baud rates above 19.2 Kbps. Refer to the manual for the device being connected to confirm support.
(2) The combined cable length for RS-422A/485 is 500 m including branch lines.
(3) The maximum cable length is limited to 2 m when an NT-AL001 Link Adapter is connected.
(4) Branch lines must be a maximum of 10 m long.
Schematic diagram
RS-232C
RS-232C
interface
NT-AL001
RS-232C
RS-422A/485
Resistance
ON
NT-AL001
RS-232C
RS-422A/485
Resistance
ON
NT-AL001
RS-232C
RS-422A/485
Resistance ON
NT-AL001
B500-AL001-E
RS-232C
RS-422A
Resistance
/485
ON
NT-AL001
NT-AL001
RS-232C RS-232C
Resistance
ON
RS-232C
RS-422A/485
RS-232C
Resistance ON
5-V power
NT-AL001
Resistance ON
5-V power
RS-232C
interface
RS-422A/
485
interface
RS-422A/485
interface
Resistance ON
RS-422A/485
interface
Resistance ON
RS-232C
interface
Appendix F
695