GE ALPS Instruction Manual page 228

8.4 REMOTE COMMUNICATION INTERFACE
The required configuration settings are listed in the table below:
Table 8–5: CONFIGURATION SETTINGS FOR THE MODEM CONNECTED TO THE RELAY
COMMAND DESCRIPTION
E0 Disable command state echo
L0 Low speaker volume (desirable, not required)
Q1 Disable result code display
&C1 DCD (Data Carrier Detect) tracks the received signal
&D0 Modem resets on the ON-OFF transition of DTR (Data Terminal Ready)
&Q0 Asynchronous mode
S0=1 Enable auto-answer
If any of the settings in Table 8–5 cannot be implemented the modem may not answer, the relay may not connect properly,
or you may not be able to log into the relay. With a Hayes V-Series 2400 SmartModem or equivalent, the relay modem per-
forms a modulation handshake with the PC modem to set the baud rate of the relay modem. The default setting of N1 per-
mits handshaking to occur at any baud rate supported by both modems. This is one reason why it is better to use identical
modems at each end.
Note that auto-answering is controlled by register S0:
• S0=0: disables auto-answer.
• S0=1: the relay modem answers incoming calls after one ring. S0 can be set for any value between 1 and 255, if it is
desirable to delay modem answering. Note that ALPS-LINK (version 1.05 or higher) configures the PC modem to wait
60 seconds for the relay modem to answer. If the relay modem register S0 is set higher than 12 (answer after 12 rings),
the PC modem may time out and hang up before the relay modem can answer. S0=12 corresponds approximately to
the 60 second delay (S7=60) at the PC modem; however, you should verify the number of rings that correspond to 60
seconds for a particular application.
Table 8–6 lists the modem command set required to communicate to the relay from a remote PC.
8
8-26 ALPS Advanced Line Protection System
8 LOCAL USER INTERFACE
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