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© Sealevel Systems, Inc.
SeaI/O | SL9049 11/2021
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 (Part# 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 ensure 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
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.