Open Collector OC1, OC2 and OCF outputs
Open collector output with a negative closing. It 'always on. Shuts down in case of blocking the
operation of the device or lack of power. The working scheme of this output is as follows:
When the transistor is in standby, on the collector there is no tension. When activated through
the resistance base, the transistor enters in conduction, giving a negative voltage output. To
test the output, just connect a multimeter between the positive and the collector (on the divice
is present a positive voltage of +12 V). When the open collector output is active between the
collector and the positive supply voltage of 12V will be measured.
Note
: On the concentrator module is only active output OCF. The outputs OC1 and OC2 are
not currently used.
Using the OCF Open Collector output
The output OCF (Open Collector Fault) is a security check of operation of the concentrator
module. Its always active until the concentrator is in operation. In case of lack of both power
supplies, battery and 230VAC (or fault of the fuse F1 to the concentrator without power
supervised ALM-6814), or blocking the operation of one of the two microprocessors on board,
there OCF output will be no voltage. Its very important to use this output when using the
concentrator ALM6815 and ALM6814 in stand-alone mode. In bus mode these reports are
controlled by the central unit ALM-6800.
Important Note: The use OCF output is necessary for the reporting of the failure of
the concentrator.
Will be illustrated three ways to use this output. These rules also apply for any open collector
output of any system, with close to negative.
Installation and Programming Manual V1.2
13
