User's Manual

ACU Basics STRATEGIC Technologies Inc

iTRX Series Users Guide (STI) Feb 6, 2004

During a call, if successful, the ACU will receive configuration parameters, the current date / time from

the central computer, and all stored information in the ACU will be transmitted to the CC. It will also

receive the participant’s curfew information for the current day and the following day. When the call

has been completed, the ACU will display the result of the call, either "Call Successful", or an error

message such as "No Dialtone", "CC Busy", etc. (See Call Attempt Error Messages Page 8 for more

details).

Between phone calls, the ACU will display only the date and time. When the ACU attempts to call the

central computer, the ACU will report its status on the bottom line of the display.

ACU Calling the Central Computer (CC)

The ACU will periodically call the central computer, for either a scheduled call-in check, to report an

alarm or to report an alarm clear event. These calls will proceed in exactly the same fashion as

described in the section above “ACU Operation”. If a call attempt fails, the ACU will display the reason

for the failed call attempt on the bottom of the display. The ACU will attempt to call again in a few

minutes, and repeatedly at varying intervals, until the maximum re-dial attempts (14 attempts) are

made. Any event that is generated after the maximum re-dial attempts are made will cause the ACU to

repeat the dialling sequence. While the ACU is waiting to make another call attempt, if the previous

attempt failed, a code indicating the reason for the failure will be displayed at the bottom right corner of

the display. This code matches the previously displayed message.

The codes are as follows:

Call Attempt Error Messages

Code

Display Message Description

2 CC Busy The CC number was busy.

3 No Dialtone The participant’s phone line was already in use.

4 No Connect The call was interrupted while the ACU was dialling or the

ACU dialled but never connected to the CC.

5 Communication Error The call was interrupted while connected to the CC.

B Blind Dial If any call attempt errors occur while the ACU is in blind dial

mode a “B” will be placed to the right of the numeric code.

(See below for more information on blind dial mode).

JAN05/03 02:32PM

Call Successful