8-1
Chapter 8
4230/4232/4235
Communications modules
Hardware Systems
If you are using the Cotag Access Control Software, each set of
Controllers linked to a PC is called a “Hardware System”. You can
have more than one Hardware System connected to a single
computer, or to any of the computers on your local area network.
Local Hardware Systems
A Local Hardware System is a set of Controllers which is always on
line and communicating with the host computer. Each Local
Hardware System communicates with the computer via a piece of
software called a “Comms Driver”.
Remote Site Hardware Systems
A Remote Site Hardware System is a set of Controllers which only
communicates with the host computer when it is connected via a
normal dial-up telephone line with a modem at each end. The host
computer is configured to make contact with the Controllers at the
remote site by dialling out at specified times, or after specified events.
The Controllers at the remote site can dial in to the host computer
when an alarm occurs, or when the transaction buffer in a Controller
is becoming full. Each Remote Site Hardware System communicates
with the computer via a piece of software called a “Modem Driver”.
Which Comms module do you need?
Communications (Comms) modules pass messages between the host
computer and 4101-2 Controllers. The model of Comms module you
must use next to the computer depends on the total number of
Access Points (Readers) in the whole system. The whole system is the
total of all the Access Points in all the Hardware Systems, both Local
and Remote Site.
• For a system with from 1 to 16 Access Points, you can use no
Comms module, or you can use 4232 Comms modules.
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