Omron C200HE User Manual

A one-to-one NT link that uses NT link commands can be established by con-
necting the RS-232C port of the PC to the RS-232C port of a Programmable Ter-
minal (PT).

A one-to-N NT link that uses NT link commands can be established by connect-
ing the PC and Programmable Terminal (PT) with RS-422/485 cable.

The following diagram shows the connections for a one-to-one NT link.

PT

The following diagram shows the connections for a one-to-N NT link. Up to 8
Programmable Terminals can be connected unless the PC is a C200HE-
CPU

-E. With a C200HE-CPU

-E, up to 4 Programmable Terminals can

be connected (including connections through a Communications Board).

1:N NT link
RS-422/485

See
note

RS-232C 

↔

 RS-422/485 Adapter

The following table shows the maximum number of PTs that can be connected to
each port.

C200HE

4

4

4

C200HX/HG

8

8

8

Make the following settings when establishing an NT link.

One-to-one

Built-in RS-232C port

Set bits 12 to 15 of DM 6645 to 4.

Communications Board port B

Set bits 12 to 15 of DM 6550 to 4.

Communications Board port A

Set bits 12 to 15 of DM 6555 to 4.

One-to-N

Built-in RS-232C port

Set bits 12 to 15 of DM 6645 to 5.

Set the max. node number (1 to 7) in
bits 08 to 11 of DM 6545 (1 to 3 for
the C200HE).

Communications Board port B

Set bits 12 to 15 of DM 6550 to 5.

Set the max. node number (1 to 7) in
bits 08 to 11 of DM 6550 (1 to 3 for
the C200HE).

Communications Board port A

Set bits 12 to 15 of DM 6555 to 5.

Set the max. node number (1 to 7) in
bits 08 to 11 of DM 6555 (1 to 3 for
the C200HE).