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8-1 Introduction
The RS-232C port and peripheral port built into the C200HX/HG/HE PC’s CPU
Unit support the following communications functions:
• Communications with Programming Devices (e.g., Programming Console or
SSS.)
• Host Link communications with personal computers and other external de-
vices.
• RS-232C (no-protocol) communications with personal computers and other
external devices.
• One-to-one link communications with another PC.
• NT link communications (one-to-one or one-to-N) with Programmable Termi-
nals (PTs) equipped with an NT link interface.
In addition to these communications functions, optional Communications
Boards that support Protocol Macros can be installed in most C200HX/HG/HE
PCs.
The following table summarizes the communications functions.
Function Connected device Connection Summary Related
instructions
Host Link Host computer or PT One-to-one
or One-to-N
Provides communications between a
host computer and PC.
The PC’s operating status and the
contents of data areas can be moni-
tored from the host computer.
TXD(––) can be used to transmit data
from the PC’s data areas to the host
computer.
Host Link commands,
TXD(––)
RS-232C
(no protocol)
Host computer or
other RS-232C device
One-to-one TXD(––) and RXD(––) can be used to
manage simple data transfer se-
quences such as inputs from bar code
readers or outputs to printers.
Control signals RS, CS, ER, and DR
can be controlled by the instructions.
TXD(––), RXD(––)
One-to-one Link PC One-to-one Makes a one-to-one connection be-
tween two PCs using the LR areas of
the PCs.
---
NT Link PT One-to-one
or One-to-N
Provides data transfers between the
PC and one or more PTs.
---
Protocol Macro Other serial device One-to-one
or One-to-N
The Protocol Macro function allows
the user to define separate data trans-
fer sequences and transfer mes-
sages.
Up to 1,000 communications se-
quences can be registered.
A support program is provided that
simplifies creation of communications
sequences.
PMCR(––)
Introduction Section 8-1