Omron NT31 NT31C manual When Using the Memory Link Method Setting the Front Switches

Connecting to the RS-232C Port at the Host Section 4-1

When Using the Memory Link Method

Setting the Front Switches

Set the unit number of the serial communication unit by using the rotary switch located on the front panel. Set each switch with a flat blade screwdriver so that the values or symbols in the setting value window agree with the following.

SCU21

RUN	RDY
ERC	ERH
SD1	SD2
RD1	RD2

UNIT		F	Set the unit number to 0 through F so
No.	10		that it will not overlap with the numbers
	32
	4
	56789		used in other units.

Allocation DM Area Settings for CPU

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, the channel numbers of the allocation DM area and settings are shown.

			Word m = DM30000 + (100 ⋅ unit number)
Allocation DM area (CH)		Writing		Settings
Port 1	Port 2	Value
m	m+10	8200		NT link (1:N) mode
m+1	m+11	000A		Communications baud rate (high-speed)
m+6	m+16	000j		j = The largest model number of the
				connected PT (0 - 7)

In the memory link method, the connection can be made to a personal computer with RS-232 and an FA computer, etc.

When connecting to the host in the memory link method, it is necessary to create a program for the memory link at the host side.

The following are the communication conditions that can be used in the memory link method. For the host (a personal computer, an FA computer, etc.), its setting should be compatible to one of the communication conditions listed in the follow- ing table. Set the same communication conditions at the NT31/NT31C by the memory switch. (page 165).

Item	Settings at the host
Input/Output port	RS-232C
Communication speed	1200, 2400, 4800, 9600, 19200, 38400 bps.
Data bits length	7 bits, 8 bits
Stop bits length	1 bits, 2 bits
Parity	None, even, odd
Flow control	None, RS/CS, XON/XOFF

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