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1-2SectionProtocol Overview
7
Note A 4-wire connection must be used when using an RS-422A/485 port.
LR 00
LR 31
LR 32
LR 63
Master PC Slave PC
Master area
(sent)
LR 00
LR 31
LR 32
LR 63
Master area
(received)
Serial Communications Board
CQM1H
RS-232C
CQM1H or other C-series PC
Slave area
(received)
Slave area
(sent)
to
to
to
to
1-2-5 NT Links –– 1:N Mode
A PC can be connected to one or more Programmable Terminals (PTs) using an
RS-232C or RS-422A/485 port. The I/O memory of the PC is allocated to the
Status Control Areas and the Status Notification Areas used by the PTs, as well
as to display objects, such as touch switches, lamps, and memory tables. This
enables the status of the I/O memory in the PC to be controlled and monitored by
operations from the PTs, without the use of a ladder diagram programming in the
PC. Up to eight PTs can be connected to a PC.
Note The user does not need to be aware of NT Link commands. The user only has to
allocate the PC memory to the PTs.
PT
PT
PT
CQM1H
CQM1H
Serial Communications Board
Serial Communications Board
RS-422A/485
1:1
1:N
1-2-6 NT Links –– 1:1 Mode
The functionality of the 1:1 mode is the same as that of the 1:N mode, but only a
1:1 connection is possible. The 1:1 and 1:N modes are not compatible as proto-
cols.
PT
CQM1H
Serial Communications Board
1:1