Omron Programmable Terminals NT31 NT31C User Manual

Page 70

4-1

Section

Connecting to the RS-232C Port at the Host

C200H/C1000H/C2000H CPU mounting type: 3G2A6-LK201-EV1

Setting the Rear Switches

SW1

SW2

SW3

@ Unit #, parity, and transfer code

(DIP SW1-1 to SW1-5)

Set SW1-1 to SW1-5 to OFF (0).

* Parity is fixed at Even Parity. Transfer code is

fixed at ASCII 7 data bits and 2 stop bits.

@ Communications speed (DIP SW2-1 to SW2-4)

Set these switches to 0010 to select 19,200 bps.

Set these switches to 1010 to select 9,600 bps.

(0: OFF 1: ON)

@ 1-to-1/1-to-N selection (DIP SW2-6)

Set SW2-6 to OFF (0) (1-to-N).

@ Instruction level (DIP SW2-7, SW2-8)

Set these switches to ON (1).

(Levels 1, 2, and 3 are enabled.)

@ CTS selection (DIP SW3-1 and SW3-2)

Set SW3-1 to ON (1), and SW3-2 to OFF (0).
(Set this always to 0V.)

@ Synchronization (DIP SW3-3 to SW3-6)

Set SW3-3, SW3-5, and SW3-6 to ON (1), and
SW3-4 to OFF (0). (Set these to Internal.)

Connecting to a CVM1/CV Series Host Link Unit

CVM1/CV series backplane mounted type: CV500-LK201

A CVM1/CV series host link unit (CV500-LK201) has two connectors (commu-
nication ports 1 and 2). Either of these ports can be used for connection to an
NT31/NT31C by the RS-232C method. However, since the connectors at these
ports are of different types, a cable that matches the connector must be pre-
pared.
• Communication port 1

Communication port 1 is a 25-pin connector for RS-232C use only.

• Communication port 2

Communication port 2 is a 9-pin connector which allows selection of the
RS-232C or RS-422A method. When this port is used with the RS-232C meth-
od, the I/O port selector switch on the front of the unit must be set to RS-232C
(the upper position).

CPU Bus Unit Settings
When connecting to a CVM1/CV series host link unit, set the following commu-
nication conditions for the CPU bus unit settings.

Item

Setting at Host

Communications speed

Set the same speed as set at the NT31/NT31C

(*1)

Transfer code

ASCII, 7 data bits, 2 stop bits

Parity

Even

1-to-1, 1-to-N

1-to-N

(*2)

Instruction level

Level 1, 2, 3

*1 Set the host link communications speed at 9600 bps or 19200 bps with the

memory switch at the NT31/NT31C. For details, refer to Setting the Host Link
Method (page160).