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8-5
NT Links
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.
One-to-one NT Links
The following diagram shows the connections for a one-to-one NT link.
PT
One-to-N NT Links
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
Note:
RS-232C
↔
RS-422/485 Adapter
The following table shows the maximum number of PTs that can be connected to
each port.
PC
RS-232C port
Communications
port A
Communications
port B
C200HE
4
4
4
C200HX/HG
8
8
8
PC Setup
Make the following settings when establishing an NT link.
Link
Port
Setting
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).
NT Links
Section 8-5
Summary of Contents for SYSMAC C200HE
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