Mitsubishi Electric MELSEC iQ-RJ71C24-R2 - Page 202

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7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
General procedure
This section explains the general procedure for nonprocedural protocol/bidirectional protocol (executed in full-duplex
communication) data communication using the modem function between the CPU modules with C24 installed.
■System configuration
■General procedure
1. Perform initial setting for C24 at both station A and station B.
2. Perform modem/TA initialization on station B.
3. Perform modem/TA initialization and line connection on station A.
4. Communicate data using the nonprocedural protocol/bidirectional protocol.
5. In order to end the communication, disconnect line from station A that initiated the line connection.
■Processing flow
Station A
Station B
Public line
Modem
RS-232
cable
Modem
RS-232
cable
Y11
X10
X12
Y12
X14
(ON)
X10
X12
Y12
(OFF)
X14
(OFF)
*
Station A
(connection request side)
Connection Communication Disconnection
Connection
request
Modem initialization
completion
Connecting
Disconnection
request
Disconnection
completion
RS-232 CD terminal
Station B
(connection reception side)
Modem initialization
completion
Connecting
Disconnection
request
Disconnection
completion
RS-232 CD terminal
It is possible to disconnect line from Station B, as well.