Honeywell CNI2 User Manual

CNI2
O
perating and Installation
Guide
82
DTR Detection Jumper
Disconnect on DTR Low
Some serial devices may indicate a desire to terminate a call by simply deactivating a control
line. On the CNI2’s TB2 terminal block is an input line called DTR.
If the DTR input line on
the
communications terminal block
is positive when the call starts, and then
goes negative
while the
call is in progress
, the CNI2 will terminate the
call
.
As discussed earlier
two remote devices can be wired to the same CNI2 using the optional
Serial Po
rt Multiplexer board. Either remote device can deactivate the DTR line but the CNI2
will not be able to determine which device is actually doing this. It might be possible that the
call started by one device might be accidently terminated by the other
device. In this case you
might consider having the serial devices trigger an alarm input on the CNI2 rather than using the
DTR line.

Honeywell CNI2 Specifications

General

Brand	Honeywell
Model	CNI2
Category	Recording Equipment
Language	English