Chapter 5: Installation
P/N 3101890-EN • REV 006 • ISS 21JUN18 91
Note: Refer to the VM-1 Compatibility List (P/N 3101804-EN) for a list of compatible cellular capture modules.
Refer to the Cellular Capture Module Configuration Application Guide (P/N 3102371-EN) for model-specific
programming and wiring requirements.
The VM-DACT can support 255 accounts and communicate with 80 receivers in the Contact ID protocol.
The VM-DACT configuration settings made in the VM-CU define the line properties, receiver attributes, account
parameters, and transmission details.
Line types
The VM-DACT can be configured as a one- or two-line dialer, a modem, or a modem and one- or two-line dialer.
Central Monitoring Station dialing
The VM-DACT electronically dials receivers in the CMS using either pulse or tone dialing, as specified in the VM-
CU. The module dials the stored CMS telephone number using the same digits that would be used if a person
were dialing from the premises with an ordinary telephone.
Call timers
The VM-DACT sends messages in order of their priority. Messages may include device and user ID information
regarding events, such as openings, closings, alarms, and tamper or trouble events. The module waits for
acknowledgement that each message sent has been received. Where necessary, the VM-DACT can be
configured to begin dialing without waiting for a dial tone. This option is used in areas where the telephone line
has an absent or erratic dial tone.
Transmission process
The VM-DACT includes features that provide an appreciable level of transmission integrity. Multiple telephone
lines and multiple telephone numbers help to ensure that a call to the receiver gets through.
The VM-DACT module sequences through the following basic steps to contact the CMS receiver.
1. The VM-DACT seizes one of the telephone lines and puts the line on-hook for a minimum of 3 seconds.
This cuts off any ongoing call and disconnects the line from any telephone or dialing devices that are
connected downstream.
Note: The module tries to select an unused line for its first two attempts.
2. The VM-DACT takes the line off-hook and waits for a dial tone.
The Line 1 or Line 2 LED indicates.
If a dial tone is not received by the configured time, the module goes on-hook, increments the attempt
counter, and continues to alternate lines and numbers until a dial tone is acquired.
If the VM-DACT is configured with two telephone numbers and only one telephone line, it will make four
attempts using the first telephone number, then four attempts using the second telephone number. This
alternation of telephone numbers continues as needed until a connection is made or the configured number of
dial attempts has been made.
Note: In areas where the telephone system has no dial tone, or where the dial tone is erratic, you can
configure the VM-DACT to dial without waiting for a dial tone.
3. The VM-DACT dials the CMS using the programmed dialing mode and telephone number.
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