Chapter 7 Communications By The Modem Function; Overview - Mitsubishi Electric MELSEC iQ-R Series User Manual

7
COMMUNICATIONS BY THE MODEM
FUNCTION
This chapter explains the overview and how to use the modem function, which can be used for data communication with
remote target devices.
For the transmission specification on C24 side, connectable modems/TA's (terminal adapter) for the usage of the modem
function, refer to the following manual.
MELSEC iQ-R Serial Communication Module User's Manual (Startup)
7.1

Overview

The modem function easily performs data transmission/reception to remote devices via public lines/office telephone systems/
digital lines (ISDN) by connecting a modem or TA (terminal adapter) to RS-232 interface of C24.
Initialization of the modem or TA, line connection (dialing), and modem disconnection are performed by CPU module.
Once the line is connected, data communication with the target device via public line/office telephone system/digital line can
be performed.
*1 TA indicates the abbreviation for the terminal adapter.
The modem function does not support dedicated lines.
When transmitting/receiving data via dedicated line, prepare a modem having an automatic connection
function and supporting dedicated lines.
Since the data can be transmitted/received without using the modem function when transmitting/receiving
data via a modem having an automatic connection function and supporting dedicated lines, this chapter can
be skipped.
Automatic connection function: Indicates a function for connecting to the modem of the target device
automatically. (The function name varies depending on the manufacturer of the modem.)
7 COMMUNICATIONS BY THE MODEM FUNCTION
148
7.1 Overview
C24
Modem/TA
(*1)
RS-232
(*1)
Modem/TA
Target device