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PN 88300150
Another asynchronous mode issue is 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.
DTR dialing is functional in V.25bis mode, except the number dialed is from the V.25bis mm memory
location 01. Also, 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.
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
RS232 lines such as DSR and CTS act as specified in the V.25bis standard). Set-up involves proper DIP-
Switch settings, and soft-switches (software controlled conditions).
V.25bis DIP-Switches
12-Position DIP-Switches
#1 - Unforced DTR
#2 - NA
#3 - NA
#4 - NA
#5 - Auto-Answer enabled
#6 - DSR/CD unforced
#7 - RTS unforced
#8 - Command Mode forced
#9 - NA
#10 - NA
#11 - NA
#12 - NA
4-Position DIP Switches
#1 - Unforced CTS
#2 - Dial-Up
#3 - Varies per modem model
#4 - Async/Sync mode set per requirements
Jumper Plugs
CTS/RTS - CTS independent of RTS
DSR - DSR independent of CD
MI/MIC - NA
SLDC/BSC - If in Synchronous mode, set per requirements.
4/3/01
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