7 COMMUNICATIONS BY THE MODEM FUNCTION
7.4 Startup of the Modem Function
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7
Data communication
The following explains the considerations for data communication with target devices using the modem function.
Requirements for data communication
■When communicating data with target devices
Perform the appropriate processing up to line connection or modem/TA initialization, depending on whether or not the line
connection is initiated from the C24 side.
After line connection, data communication can be performed using an MC protocol/nonprocedural protocol/bidirectional
protocol in full-duplex communication.
• When line connecting from the C24 side, complete the processing up to line connection beforehand. (Page 190 Line
connection)
• When line connecting from the target device, complete the processing up to the initialization of the modem/TA beforehand.
(Page 185 Initialization of modem/TA (terminal adapter))
Buffer memory and input/output signals to be used
■When communicating data with target devices
Only buffer memory and input/output signals used for data communication (MC protocol/nonprocedural protocol/bidirectional
protocol) is used.
Communicate data using the ON of 'Connection' (X12) as the interlock signal.
There is no input/output signal or buffer memory for modem functions used in data communication.
X12
Program for data communication
*
Y10
(ON)
X10
Y11
(ON)
X12
(ON)
*
Initialization
request
Modem initialization
completion
Connection
request
Connecting
RS-232 CD terminal
Set "Display a result code
using the AT command" in
the host station side modem.
Result code
receive
Initialization Dial Data communication is possible
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