Dial/Leased Line (&L); Asynchronous/Synchronous Mode Selection (&M) - Black Box 325 User Manual

MODEM 325 AND MODEM 325 CARD
6.11.11 D /L
IAL EASED
If operating on dial-up lines, enter AT&L. If operating on leased lines, enter AT&L1 for 2-wire or
AT&L2 for 4-wire.
Command
&L
&L1
&L2
†default
6.11.12 A
SYNCHRONOUS
The AT&M commands select synchronous or asynchronous operation and V.25 bis autodialing protocols.
AT&M selects asynchronous mode.
AT&M1 selects synchronous mode 1. Calls are placed asynchronously. Operation switches to
synchronous when connecting.
AT&M2 selects synchronous mode 2. The modem automatically dials a stored number when it detects
an off-to-on transition of DTR. Use the AT&Dn command to select the action to be taken on a DTR
transition.
AT&M3 selects synchronous mode 3. Calls are placed manually.
AT&M4 selects synchronous mode 4. V.25 bis autodialer set for Bisync protocol.
AT&M5 selects synchronous mode 5. V.25 bis autodialer set for SDLC protocol.
Use register S30 to select EBCDIC/ASCII and NRZ/NRZI for data format.
Table 6-25. Asynchronous/Synchronous Mode Selection (&M).
Command
&M
&M1
&M2
&M3
&M4
&M5
†default
7 6
L (&L)
INE
Table 6-24. Dial/Leased Line (&L).
Operation
Dial (switched)†
Leased (private) 2-wire
Leased (private) 4-wire
/S M
YNCHRONOUS ODE
Operation
Asynchronous mode†
Synchronous mode 1
Synchronous mode 2
Synchronous mode 3 (V.25 bis disabled)
Synchronous mode 4 with V.25 bis Bisync
Synchronous mode 5 with V.25 bis SDLC
S (&M)
ELECTION