Impulse 520W - Manual (Page 66)

Wiring Options
SeaI/O Pass-Through Connector
All SeaI/O modules include two RS-485 pass-through connectors on the left side of
the unit that are internally connected to the same pins on the screw terminals. This
offers two convenient options for adding additional expansion modules.
For connecting several SeaI/O modules together in a “stack”, all N-series expansion
modules ship with an expansion and strap kit (item# KT122) that includes four metal
straps, four #4-40 screws, and a 5” RJ45 RS-485 interconnect cable (item# CA239).
The metal straps allow you to securely connect multiple SeaI/O modules together.
The interconnect cable can be used to connect SeaI/O modules together via the RJ45
pass-through connectors, providing an easy method to cascade RS-485 signals and
power from one module to the next.
For expansion modules that are less than ten feet from a base unit, a standard RJ45
CAT5 patch cable (“straight-through”) may be used. For SeaI/O modules greater
than ten feet apart, use twisted-pair cable connecting the data lines to the screw
terminals instead. If RJ45 connectors are preferred, be sure to connect only the data
lines (pins 4 & 5).
NOTE: When using standard CAT5 patch cables to connect modules less
than ten feet apart, ensure the cables are wired “straight-through.”
DO NOT connect network crossover cables to the pass-through
connectors, else damage to equipment may result.
NOTE: Modules greater than ten feet apart must have separate power
supplies. Refer to the Power Options section of this manual for
recommendations.
© Sealevel Systems, Inc. - 63 - SeaI/O User Manual