53A-334 REED RELAY SCANNER CARD
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DESCRIPTION
The 53A-334 Reed Relay Scanner Card is a printed circuit board assembly for use in a CDS
53/63 Series Systems. T h e 53A-334 Card provides 3 2 1 -wire channels o f analog-signal
acquisition at a maximum switching rate of 350 channels per second. U p to ten 53A-334 Cards
can be plugged into one 53 Series Card Cage to allow scanning of up to 320 channels. The 63
Series Card Cage can accommodate up to five 53A-334 Cards which allows scanning of up to
160 channels. As many as ten 53/63 Series Card Cages can be configured together to provide
either a 53 Series System with up to 3,200 1-wire channels, or a 63 Series System with up to
1,600 channels. The 53A-334 Card may be mixed with other 53/63 Series System scanner cards
(53A-33X Series) in the same card cage.
A channel may be selected (closed) randomly by transmitting ASCII characters from the system
controller to the 53/63 Series System. T h e on-board diagnostic features include 14 indicator
LEDs and channel status readback. During channel status readback, the 53A-334 Card returns
a 2-digit decimal number to the system controller indicating the number of the closed channel.
The readback feature uses a third pole on each relay to provide a complete on-board self-test
capability which includes testing t h e relay coil. I f more t h a n o n e relay i s closed
simultaneously, an error code is generated.
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