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© Sealevel Systems, Inc. eI/O Manual | SL9221 01/2023
Many relay racks allow the modules to be powered by an external power supply. This can allow
more higher powered devices to be used. In this case, a jumper on the relay rack must be
disconnected so the external power supply does not back power the 160E/POE via pin 49. Contact
the manufacturer of the relay rack to determine how this jumper can be disconnected.
50-PIN HEADER CONNECTOR
The eI/O-160 has the following pin out which is compatible with a wide variety of industry standard solid-
state relay racks.
TTL LOGIC & EXAMPLE CIRCUITS
The eI/O-160 uses 74ABT245B octal bidirectional transceivers to provide TTL input/output capabilities.
Ea
ch bit is pulled to +5V through a 10K Ω pull
-up resistor to insure each bit is at a known state when not
driven. If an input is not connected to ground, it will read as a one (1) due to the 10K Ω pull
-up resistors on
each port.