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MultiModemISI Hybrid Series, ISIHI-2S 45
Chapter 3—Software/Driver Installation
Call Control Configuration
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Persistent DTR Dialing ____________________
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
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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=
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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=
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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.
X.75 Protocol
—packet-switched network protocol for international use. Layer 2
portion commonly is used as a rate adaption protocol.
PPP Protocol
—provides rates up to 64 Kbps per channel.
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Stored Numbers _________________________
The TA can optionally store as many as 10 phone numbers, up to 20 characters each.
AT command: &Z=
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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