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Page 9 of 12
AMG5904A966B9 Instruction Sheet
D22153-00.doc
be accessed by removing the 2 fixing screws in the rear panel and sliding the PCB out of the
enclosure.
For clarity, in the 3 examples shown below all 4 data ports D1-D4 are terminated the same, but each
data channel may be configured & terminated independently as required. The 3 examples shown are
RS-232 (no termination), RS-422 (120Ω) or RS-485 (120Ω).
Alarm Channel Configuration
The
AMG5904A966B9
provides 8 bi-directional contact closure inputs / alarm outputs. Each ALARM
IN input is via an internal 10kΩ series resistor with a 47kΩ pull-up resistor to the in3V3 supply.
Each ALARM OUT output can receive an on/off signal from an
AMG5903A966B9
and is typically used
to convey contact closure status. Each alarm output is NPN open collector, maximum load 500mA /
24Vdc.
Alarm Channel Circuit
The output of each alarm channel is an NPN open collector transistor circuit, with an absolute
maximum rating of 1A / 60V. There is a common GND for all alarm channels.
