462 series – 96 channel ttl db-78 – Impulse 520W User Manual
Page 14
462 Series – 96 Channel TTL DB-78
Perfect for driving industry-standard solid-state relay (SSR) racks, the SeaI/O-462
provides 96 bits of buffered drive TTL I/O. Each DB-78 connector brings out 48 I/O
bits addressable as six, eight-bit ports. For easy connection to relay racks, Sealevel
offers a six-foot cable (Item# CA237) that terminates each DB-78 connector to two
industry standard 50-pin IDC connectors. Order part number 462x-KT and receive
two CA237 cables with each unit.
The SeaI/O-462 uses 74ABT245 octal bi-directional transceivers to provide TTL
input/output capabilities and can sink 64mA and source 32mA. Each bit is pulled to
+5V through a 10K ohm pull-up resistor to insure each bit is at a known state when
not driven.
Power Requirements
Max Output Power:
+5VDC @ 1A (5W)
Inputs
Logic High:
Max 0.8VDC
Logic Low:
Min 2VDC
Outputs *
Logic High:
Max 0.5VDC @ 64mA
Logic Low:
Min 2VDC @ 32mA
NOTE:
The SeaI/O-462 modules are designed to work with industry
standard solid-state relay racks that expect negative logic to operate.
The SeaI/O-462 modules expect negative logic on the inputs.
© Sealevel Systems, Inc.
- 11 -
SeaI/O User Manual