User Manual

Central Network Controller Installation Guide 15162 Ver 2.8 DRAFT E

5.2 Dial-Up Communications

5.2.1 Description

By using dial-up devices, it is possible to communicate with more than 3 sites or with sites too distant to

be directly connected. Dial-up sites require the use of dial-up devices connected to standard public

(PSTN) telephone lines or LAN/WAN network.

From the administration software, remote sites are assigned to one of the three RS-232 ports on the

CNC. The CNC will dial up sites via the dial-up device connected to one of the RS-232 ports. A dial-up

device installed at each site, connected to the remote master door controller will answer the call.

Once communications are established, the CNC will receive transactions from the door controller and

send any database updates. A communications session will last as long as required for all transactions to

be received and all updates to be sent or until a programmable pre-set time limit expires.

5.2.2 Dial-Back

Normally events are only sent back to the central point at set times of the day when the CNC dials up the

site. This may be satisfactory for records of normal access events, however if an alarm occurs this would

not be reported until the next routine dial-up. A feature of the door controller allows it to 'dial-back' to the

CNC in the event of an alarm condition.

PAC

Portico

2200/

1200

Series

The current version PAC Portico 2200/1200 Series Door Controllers also allows the door controller to be

programmed so that in the event of an Access Authorized, Exit Authorized or Entry

Authorized transaction being generated the door controller will dial-back to the CNC. This powerful

facility may be configured on an individual door basis for each door controller on the site. For example, it

is possible to configure the master door controller so that it will dial-back in the event of access being

authorized through door one on each of door controllers 2, 3 and 4 on the site but not on any other doors.

This is in addition to dialing back in the event of any alarm occurring. Detailed information on

programming this feature is included in 15263 PAC Portico 2200/1200 Series Controllers Installation

Guide. The dial-back option can be set via the administration software.

The door controller stores one or two telephone numbers which it will use for the dial-back. A dial-up

device on the CNC will answer the call and connect to the door controller. Once the calling site has been

identified, all the high priority transactions will be sent from the site and only high priority commands will

be sent from the CNC to the site, allowing alarm acknowledgements to be sent back to the door

controllers. To ensure that a dial-back dial-up device is not tied up too long, the dial-back will be aborted

after 2 minutes of inactivity.

It is recommended that one dial-up device is used for routine dial-ups, and a second connected to another

CNC port, to be used for dial-back only. You could use the routine dial-up device as the backup dial-up,

i.e. the second phone number programmed into the door controller.

Note

When a dial-back occurs no low-priority transactions will be uploaded to the CNC and no ‘updates’

will be downloaded to the door controllers on the site.