Multitech BA-Series User Manual page 100

MultiModemBA User Guide
DTR Dialing ($D) Command
DTR Dialing is an alternate method of causing the modem to automatically dial a number. Data
Terminal Ready (DTR) is a signal that comes into the modem from the terminal or computer to which
it is connected via pin 20 of the RS-232 interface. In DTR Dialing, the modem will automatically dial a
stored number as soon as it receives a high DTR signal. The DTR Dialing method is popular when
using the modem in synchronous applications.
To enable DTR Dialing, enter command AT$D1 and hit Return. The modem will now dial the phone
number you have stored as N0 when it receives a high DTR signal.
DTR must remain high for the duration of the call, until disconnect. To disable DTR Dialing, enter the
command AT$D0 (or AT$D ) and hit RETURN.
When you use DTR Dialing, be sure that DIP-Switch #1 is in the UP position, so that DTR is not
forced on. In addition, when using DTR Dialing in a synchronous application, be sure that DIP-Switch
#8 is in the UP position to disable V.25 bis Command mode.
ITU V.25bis Country Specific Information
Due to the flexibility of the V.25 bis standard, each country may establish specific regulations
governing the way operations are handled. The purpose of this document is to detail each country's
specific regulations that affect operation of V.25 bis in Multi-Tech modems.
1. Italy
a) Command/Indication modifications
1.
b) Delayed and Forbidden list behavior
1.
2.
3.
4.
5.
c) Auto-Answer mode behavior
1.
2.
3.
2. Switzerland
a) Command/Indication modification
1.
2.
3.
4.
b) Delayed and Forbidden list behavior
1.
2.
3.
c) Auto-Answer behavior
1.
100
Phone number indications include status ;ZPSTTT
a) Z - U, D, or F, for Unrestricted, Delayed or Forbidden
b) P - Delay time if delayed
c) S - Number of retries so far
d) TTT - Interdiction time to further attempts
5 retries without delay
2 minute delay between next 4 retries
After 9 retries the number is put on the forbidden list
120 minute timer is started on entry to delay list
When it runs out, the number is removed from which ever list it is on
Auto-Answer in 5 seconds if no DIC
Get 10 seconds after DIC to enter CIC
If 10 seconds times out then no connection is possible
Modem must remain on-hook for 5 seconds after disconnect
Modem must remain on-hook for 5 minutes after 4 consecutive failed calls
If modem must remain on-hook, then it is "paused"
If the modem is paused and a call is attempted a PAU indication is given.
a) PAUt Modem is paused for t minutes
2 minute delay between 4 retries
After 4 retries the number is put on the forbidden list
The number remains on the forbidden list forever
Auto-Answer mode after 2 rings if no DIC