Omron NT631C manual 111

Connecting to the Host’s RS-422A/485 Port Section 5-2

Port 1

RS-232C

Port 2 RS-422A/485

RDY

COMM1

COMM2

PORT1

OFF ON TERM

24 WIRE

PORT2

(RS422/

RS485)

SCB41

Terminal resistance setting switch (TER)

Set to ON (Terminal resistance is present.) (right side).

Two wire type/four wire type changeover switch (WIRE) For RS-422A: 4 (4 wire type) (right side)

For RS-485: 2 (2 wire type) (left side)

Allocation DM Area Settings for CPU Unit

Settings are written from the Programming Device (a Programming Console or CX-Programmer) directly into the allocation DM area (system setting area) of the CPU Unit. After settings are written, they become effective by turning the power ON, restarting the Unit, restarting the communications port, or exe- cuting the STUP command.

In the following, the channel numbers of the allocation DM area and settings

are shown.

Allocated DM	Setting	Setting Contents
Area words
Port 2
DM32010	8200	1:N NT Link Mode
DM32011	0000 to 0009 (*1)	Baud rate (standard)
DM32016	000@	@ = The highest unit number of the connected
		PTs (0 to 7)

*1 Set any value between 0000 and 0009 hex for the baud rate. The same baud rate will be used regardless of the value as long as it is between 0000 and 0009 hex.

For example, when connecting PTs with model numbers 3, 4, 5, and 6 to port 2 in the NT Link (1:N), set a value of 8200 hex for D32010, 0000 hex for DM32011, and 0006 hex for D32016.

Connecting to a CS/CJ-series Serial Communications Unit

CS/CJ-series Rack-mounting Units:

CS1W-SCU31-V1 (Port 1 and 2 are both RS-422A/485 ports.)

CJ1W-SCU31-V1 (Port 1 and 2 are both RS-422A/485 ports.)

CJ1W-SCU41(-V1) (Port 1 is an RS-422A/485 port.)

Setting the Front Switches

Set the unit number of the Serial Communications Unit using the rotary switches on the front of the Unit. Set the number or symbol in the setting dis- play window in the following way using a flat-blade screwdriver. When using a

CS/CJ-series Serial Communications Unit set the switches as shown below.

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