Multi-Tech Systems ISIHP-2S - Manual (Page 43)

Software/Driver Installation
MultiModemISI Hybrid Series, ISIHP-2S/2U 43
A high DTR (Data Terminal Ready) signal on the serial port
indicates that your computer or terminal is ready to communicate
with your TA. DTR normally goes high when a communication
program starts or is ready to dial. Persistent DTR dialing enables the
TA to automatically redial the number stored in memory location 0
whenever DTR is high, and the serial port does not have an active
call. You can enable or disable this feature. AT command: $D
• Auto Answer Data Calls _________ Rings to Answer_________
Select Auto Answer if you want the TA to automatically answer all
incoming data calls (option does not affect analog port). The Rings to
Answer number (range: 1—255) selects number of rings the TA waits
before answering an incoming call. Default: 1 ring. AT command:
S0=
• Dialing Method ________________________
Select either the Enbloc or the Overlap dialing method for use when
establishing a data call. Your ISDN provider determines the dialing
method. The enbloc method is used for most ISDN dialing; however,
you can select the overlap method if you are working with a private
network. AT command: %A97=
• Data Protocol _________________________
The data protocol, also known as the B-channel protocol and the rate
adaption protocol, is the language spoken over each 64 Kbps
channel between two ISDN devices. The devices on both ends of the
ISDN link must use identical protocols. AT command: !Z
V.120 Protocol—provides rates up to 64000 bps on each B channel.
PPP Protocol—provides rates up to 64 Kbps per channel.
• Stored Numbers ________________________
The TA can optionally store as many as 10 phone numbers, up to 20
characters each. AT command: &Z=
• Dialing Stored Numbers _________________
The TA can dial a number previously stored in directory number n
using the &Zn=x command. AT command: e.g., DS3