Multi-Function Control ETMFC610 http://www.entecene.co.kr
7.2.3. RTU Communication (Dialup Modem) Setup
ETMFC610 can support dial-up modem communication, Hayes-compatible, through RS232-1 port
and RS232-2 when their port types are both RS232.
7.2.3.1. Configure modem with AT commands
Before using Modem connected with ETMFC610, following setting shall be confirmed.
Configure port speed(must be done)
Set DNP communication speed the same as the speed between ETMFC610 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.
Configure no CONNECT messages(must be done)
A Hayes AT-style modem usually outputs a message when a call is received. For example:
CONNECT 9600
The modem has a "quiet mode" that disables these messages.
The AT command is ATQ1. There will be no OK printed in response to this command.
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