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5.2.4. RTU Communication Setup (DIALUP MODEM) - Option
EVRC2A can support dial-up modem communication, Hayes-compatible, through Port2 and
Port3 when their port types are both RS232.
The configuration of the Port2 for use of dial-up modem can be set on the menu “DIALUP
MODEM-1”. For the configuration of the Port3, it can be set on the menu “DIALUP MODEM-
2”. Refer to “5.2.4.4. Dialup Modem Setup” for more information about the configuration of
Port2 and Port3 for the dial-up modem communication.
5.2.4.1. Configure modem with AT commands
Before using Modem connected with EVRC2A, following setting shall be confirmed.
Configure port speed(must be done)
Set DNP communication speed the same as the speed between EVRC2A and Modem, and set
DNP communication speed slower than the speed between modems.
Configure answer mode(frequently)
The modem will answer an incoming call on the second ring using the command ATS0=2.
Configure Data Carrier Detect(must be done)
Data Carrier Detect should follow the presence or absence of a calling modem.
The AT command is AT&C1.
Configure Data Terminal Ready(must be done)
Data Terminal Ready should control the modem. If DTR is high, the modem is ready to receive
calls. If DTR is low, the modem should not receive any more calls and should hang up any
existing call.
The AT command is AT&D2.
Configure Data Set Ready(must be done)
Data Set Ready should verify the modem. DSR is always ON.
The AT command is AT&S0.
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