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© Sealevel Systems, Inc. eI/O Manual | SL9221 01/2023
160 SERIES – 32 CHANNEL TTL DIGITAL INTERFACE
Control and monitor up to 32 channels of buffered drive digital I/O with the eI/O-160. The module addresses
the 32 channels of I/O as four eight-bit ports, each programmable as input or output. Use a standard 50-
pin IDC ribbon cable to connect an industry standard relay rack for PC based control and automation of
equipment including sensors, switches, security control systems, and other industrial automation systems.
The eI/O-160 50 pin digital interface is pin compatible with the Sealevel SeaDAC Lite 8126 and will accept
8126 accessories.
Power Requirements
Max Output Power
+5VDC @ 350mA
Inputs
Logic High
Min 2VDC
Logic Low
Max 0.8VDC
Outputs *
Logic High
Max 0.5VDC @ 64mA
Logic Low
Min 2VDC @ 32mA
The eI/O-160 is designed to work with industry standard solid-state relay racks that expect negative
logic to operate. The eI/O-160 itself uses positive logic for inputs and outputs.
The eI/O-160 addresses the 32 channels of buffered drive digital I/O as four eight-bit ports. Each port
is programmable as input or output. The I/O channels are accessed via an industry standard 50-pin
header connector. Use a standard 50-pin 0.100" pitch IDC ribbon cable to connect to an industry
standard relay rack, terminal block (Item# TB07), or relay rack simulation module (Item# TA01). Each
channel can sink up to 64mA or source up to 32mA. All channels combined cannot exceed a total
output of 350mA.
Relay racks with less than 32 channels and the TA01 simulation module expect all even pins to be
commons. When using the TA01 or relay racks with less than 32 channels, set Port D as an input to
avoid shorting the outputs to ground through the relay rack.
Relay modules vary in their performance and characteristics. Discrete output modules available from
typically draw 10mA each but may draw 27mA in a worst case scenario. This actual current draw
and the number of modules used will determine how many can be powered by the +5V on pin 49 of
the 160E/POE. Contact your relay vendor to determine the actual current requirements.
