HP 3000 Series Handbook page 73

For HP Internal Use Only
• HP 92219Q - Bell, CCITT _OM, CCITT _AM
• A1703-64006 - CCITT _BIS_OM, CCITT _BIS_AM
Autodial modes: Hayes, V.25bis.
Note
"
The version of the modem has a problem when dialing with V.25bis where if
the number that is dialed is busy, DSR does not drop. This same problem
causes V.25bis error indications to be improperly decoded, meaning that the
modem timeout timer must expire before we know that the attempt failed.
This also means that multiple dialing attempt will always fail. If the DSR
jumper is set so that DSR follows DCD, this problem goes away.
The configuration of the hardware switches on the modem are:
8-position DIP-Switch:
Switch:
1 2 3 4 5 6
7
8
UP UP DOWN UP UP UP DOWN DOWN
4-position DIP-Switch:
Switch:
1 2 3 4
DOWN UP UP DOWN
For Hayes mode to work correctly, AT&RO must be set so that it drops CTS when the
connection goes down. For Hayes, AT$VO must be set. For V.25bis dialing, VT$V1 and AT$BA1
must be set.
Hayes dialing parameters:
BO E1 M1 QO RO V1 XO &E1 &E4 &E6 &E8 &E10 &E13 &E15
$MB2400 $SB2400 $BA1 &WO
SO S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S24 S25 S30
001 043 013 010 008 002 030 002 006 007 070 050 020 000 000
$AO &AO &BO &BS1 &C1 $DO &D2 #DBO $EBO $F1 &GO #LO $MIO &MO
&PO #P2 &QO &Q3 $RO &R1 &S1 $T1 &T4 $VO $VDO &XO YO
$MB2400 $SB2400 $BA1 &WO
OK
For V.22bis autoanswer, internal jumper DSR must be set so that DSR follows OH. The
factory default is for DSR to follow CD. This is different from the Support Link where the
factory default was for DSR to follow OH. There does not seem to be an AT command that
does this.
4-22 Configuration