User Manual

15162 Ver 2.8 DRAFT E Central Network Controller Installation Guide
Page 28 © 2002 Blick USA, Inc.
5.2.3 ‘Forget’ Transactions
A feature of the door controllers allows it to 'forget' (if programmed) certain groups of transactions such as
Request to Exit, Access Authorized, etc. This prevents these transactions from being sent and
therefore keeps communication times to a minimum.
Network Controller
Parallel Printer
PC
Up to 7 Slave Door Controllers,
Six-Wire Bus
Master Door Controller
REMOTE SITE (Up to 127)
CENTRAL ADMINISTRATION POINT
Modem for Normal Dial Out
Optional Modem to Receive Dial-Back Only
Modem
Figure 7 CNC Using Dial-Back
5.2.4 Communication Protection
A feature of the door controller allows dial-up communications between a CNC and the door controller to
be protected. This is done by the CNC sending its supervisor keycode to the door controller, if this
compares with the door controller's supervisor keycode, communications will be established. If the codes
do not compare, the previous supervisor keycode stored in the CNC will be compared. If this also fails
comparison, the communications session will be aborted. Refer to 15113 PAC Portico 2100/1100
Installation Guide or 15263 PAC Portico 2200/1200 Series Controllers Installation Guide for full details.
Note
If this feature is in use, you should be careful not to change the supervisor keycode in the
administration system more than once without first dialing all the remote sites, to avoid ‘locking
yourself’ out of communications with a site.
5.2.5 Phone Lines
Each dial-up device you connect to the CNC will require its own phone line. If using the dial-back feature,
the phone number of the dial-back line is the number programmed into the door controller.
If you are using the dial-back feature, ensure that the number of the dial-up device at the CNC can be
reached directly - i.e. not through a switchboard and that the number does not have ‘incoming calls
barred’.
Each site will also require a phone line.