Multi-Tech Systems MT2834BL, MT2834BA 25bis Set-Up and Initialization, 25bis Mode AT Commands

Appendix D - V.25bis Operation

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

V.25bis Mode AT Commands

The following commands will either alter standard V.25bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25bis operation.

A	Not Allowed
A/	Not Allowed
A:	Not Allowed
D	Not Allowed
D...N	Not Allowed
$D	Alters Operation ($D1 in V25bis is direct call mode)
E	Alters Operation
&F	Alters Operation (removes modem from asynchronous V.42bis mode)
N	Not Allowed
N...N	Not Allowed
O	Not Allowed
P	Not Allowed
T	Not Allowed
U	Not Allowed
W	Not Allowed
X	Alters Operation (X0 no connect message, X1 connect message)
,	Not Allowed
;	Not Allowed
!	Not Allowed
@	Not Allowed
+++AT<CR>	Not Allowed

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 108