7 COMMUNICATIONS BY THE MODEM FUNCTION
7.1 Overview
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Features
The following explains the features of the modem function.
Interface that can use the modem function
• The modem function can be used with an RS-232 interface of C24.
• For the RJ71C24-R2, the modem function can be used for only one of the two RS-232 interfaces.
With the other interface of C24, direct data communication with a target device can be performed using MC protocol,
nonprocedural protocol, or bidirectional protocol (independent operation).
Initialization/connection/disconnection of modem or TA
• The following setting value for line connection can be used by registering in the module extended parameter or flash ROM
of C24 in multiple sets.
Data for Modem/TA initialization (AT command)
User setting: 30 sets (78 bytes/set), default value: 13 sets
Data for connection
User setting: 30 sets (80 bytes/set) (display message to telephone number of the connection destination, line type, etc.)
• By registering the above data to C24 in advance, the modem/TA (terminal adapter) initialization, line connection (dialing),
and line disconnection can be performed easily.
• When the no-communication interval time (1 min to 120 min) is set, C24 disconnects the line when a no-communication
condition continues for the set period of time following the line connection.
Communication between remote device and CPU module
• Data communication can be performed via full-duplex communication.
• From the target device to the CPU module, communication using the MC protocol, nonprocedural protocol, or bidirectional
protocol can be performed.
• From the CPU module to the target device, communication using the MC protocol (transmission by the on-demand function
only), the nonprocedural protocol, or bidirectional protocol can be performed.
Communication using the modem function
Communication without using the modem function
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