4101-2 Controller Installation Handbook
2-8
Several 4101-2 Controllers on one branch
Computer
CM (addrs F)
Controller Controller Controller Controller
d/s RS485
u/s
RS232
d/s
RS485
u/s = upstream
d/s = downstream
This is the most common configuration. It uses RS232 between the
PC and a 4232, 4230 or 4235 Communications module in the first
Controller. All Controllers are linked to the Comms module on a
multidrop RS485 connection. Such a system can manage up to 32
Controllers and a maximum of 16 doors with the 4232 Comms
module, 64 doors with the 4230 Comms module, or 256 doors with
the 4235 Comms module.
Several 4101-2 Controllers on more than one branch
Computer
CM (addrs 0)
Controller
d/s 485
CM (addrs F)
u/s
232
u/s 485
d/s 485
Controller Controller Controller
CM (addrs 1)
Controller
d/s 485
Controller Controller Controller
u/s
485
d/s
485
CM (addrs 2)
Controller
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