Mitsubishi MELSEC L Series User Manual page 144

Station A
QJ71C24-R2
Q25HCPU
MODE CH1.
RUN
ERR.
USER
BAT.
BOOT
CH1.
USB
CH2.
RS-232
(General Procedure)
Station A
(connection request side)
Connection
Y11
request
Initialization
X10
completion
Connection in
X12
progress
Disconnection
Y12
request
Disconnection
X14
completion
RS-232 CD terminal
Station B
(connection reception side)
Initialization
X10
completion
Connection in
X12
progress
Disconnection
Y12
request
Disconnection
X14
completion
RS-232 CD terminal
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REMARKS
This section explains the general procedure for non procedure protocol/bidirectional
protocol (executed in full-duplex communication) data communication using the
modem function between the programmable controller CPU with Q series C24
installed.
CH2.
Modem
RS-232
cable
1) Perform initial setting for Q series C24 at both station A and station B.
2) Perform modem/TA initialization in station B.
3) Perform modem/TA initialization and line connection in station A.
4) Communicate data using the non procedure protocol/bidirectional protocol.
5) In order to end the communication, disconnect line from station A that
initiated the line connection.
Connection
(ON)
It is possible to disconnect line from Station B, as well.
3 COMMUNICATIONS BY THE MODEM FUNCTION
Public line
Modem
RS-232
cable
Communication
Station B
QJ71C24-R2
Q25HCPU
MODE CH1. CH2.
RUN
ERR.
USER
BAT.
BOOT
CH1.
USB
CH2.
RS-232
Disconnection
(OFF)
(OFF)
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