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MultiModemBA User Guide
Another asynchronous mode concern is the problem of connecting at a different speed than the
speed at which the serial port is set. If your modem port speed is different from the serial port speed,
you must either:
1) Enable speed conversion and have flow control on, or
2) Enable connect responses (with the ATX1 command) and change the serial baud rate
after receiving a connect message.
If the $VD1 command is entered when in Auto-Answer mode, the modem answers immediately upon
receiving the first ring.
There is no disconnect message (NO CARRIER) if a normal connection is made.
V.25bis Set-Up and Initialization
Before you operate your modem in the V.25bis mode, you need to make sure it is set up properly
(various RS-232 lines such as DSR and CTS act as specified in the V.25bis standard). Setup
involves proper DIP-Switch settings and soft-switches (software controlled conditions).
V.25bis DIP-Switches
#1 Unforced DTR
#2 NA
#3 NA
#4 NA
#5 Auto-Answer enabled
#6 Async - Max throughput set
Sync - Slave Clocking unforced
#8 Command Mode forced
#9 Digital Loopback Off
#10 Dial-Up
#11 Async - AT/Multi-Tech Resp.
#12 Async/Sync mode set per requirements