Omron NT31 NT31C manual Allocation DM area Writing Settings Port Value

Connecting to the Host’s RS-422A/485 Port		Section 5-2
	PCs supporting direct connection to	PCs supporting connection through a
	the CPU Unit	Serial Communication Board
	---	CS1G-CPU42/43/44/45-E(V1) (*1)
		CS1H-CPU63/64/65/66/67-E(V1) (*1)

*1 A CS1W-SCB41 Serial Communication Board is required.

Settings at the Host

Connecting to a CS1 Series Serial Communications Board

Serial Communications Board equipped with an RS-422A/485 port for CS1-se- ries CPU Units:

CS1W-SCB41 (Port 2 is an RS-422A/485 port.)

Reference: Serial Communications Boards and Serial Communications Units with lot num- ber 991220 (12/20/99) and later support the high-speed 1:N NT Link. Boards and Units with earlier lot numbers cannot be used.

Setting the Front Switches

RDY

COMM1

COMM2

Port 1
RS-232C	PORT1
OFF	ON TERM
2	4 WIRE
Port 2	PORT2
RS-422A/485	(RS422/
	RS485)

Terminator Switch (TERM)

Set to ON (right side)

Wire Selection Switch (WIRE)

RS-422A: Set to 4 (right side) for 4-wire type.

RS-485: Set to 2 (left side) for 2-wire type.

SCB41

When using the Memory Link Method

CPU Allocation DM Area Settings

Setting is written from the Programming Device (a Programming Console or CX- Programmer) directly into the allocation DM area (system setting area) of the CPU. After the setting is written, it becomes effective by turning the power ON, restarting the unit, restarting the communication port, or execution of the STUP command.

In the following table, the relevant word addresses in the allocation DM area and settings are shown.

Allocation DM area	Writing	Settings
Port 2	Value
DM32010	8200	NT link (1:N) mode
DM32011	000A	Communications baud rate (high-speed)
DM32016	000j	j = The largest model number of the
		connected PT (0 – 7)

For example, when connecting PTs with model numbers 3, 4, 5, and 6 to port 2, set the value 8200 Hex to DM32010, 000A Hex to DM32011, and 0006 Hex to DM32016.

With the memory link method, the connection can be made to a personal com- puter and an FA computer with RS-422A.

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