Omron NT31 NT31C manual C200HX/HG/HE-ZE, CPM1, CPM2A, CPM2C, CQM1H, or SRM1

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

Setting the Front Switches

I/O port selector switch

RS-232C

RS-422A

@Host link communication method selection (selector switch)

Set this to RS-422A.

@Communication type setting (DIP SW3) Set SW3 to OFF.

(for host link communication)

@Host link default value settings (DIP SW4)

To effect the existing DIP switch settings, set SW4 to ON.

To effect the values set in the PC Setup, set SW4 to OFF.

Note

For CPUs manufactured before or during June 1995 (lot No. jj65), the existing DIP switch settings differ from the PC Setup default values as follows.

-Existing DIP switch settings:

2,400 bps, 1 stop bit, even parity, 7 bit data length

-PC Setup default values:

9,600 bps, 2 stop bits, even parity, 7 bit data length

For CPUs manufactured from July 1995 onward (lot No. jj75), the stipulated values in the DIP switch settings also are 9600 bps and 2 stop bits.

@Terminator setting (DIP SW6) Set this switch to ON.

(Set terminator ON.)

C200HX/HG/HE(-Z)E, CPM1, CPM2A, CPM2C, CQM1H, or SRM1

The connection method depends upon the model of PC being used, as shown in the following table.

PC model	Connection method
C200HX/HG/HE(-Z)E	• Connect to the RS-422A port (port A) on a Communications
	Board.
CQM1H	• Connect to the RS-422A port (port 2) on a Serial Commu-
	nications Board.
CPM1	• Connect to the peripheral port through a CPM1-CIF11
	RS-422A Adapter.
CPM2A, SRM1	• Connect to the peripheral port through a CPM1-CIF11
	RS-422A Adapter.
CPM2C	• Connect to the peripheral port (on a CPM2C-CN111 or
	CS1W-CN114 Connecting Cable) through a CPM1-CIF11
	RS-422A Adapter.
	(The CPM2C-CN111 splits the Unit’s Communication Port
	into a RS-232C port and a peripheral port.)

Reference: S There are no Communication Boards for the C200HX/HG/HE(-Z)E in which port B is the RS-422A port.

SThere are no Serial Communication Boards for the CQM1H in which port 1 is the RS-422A port.

PC Setup Area Settings

When connecting to a C200HX/HG/HE(-Z)E or CPM1, CPM2A, CPM2C,

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