Impulse 463N - Manual (Page 86)

©Sealevel Systems, Inc.
SL9049 - 11/2010
SeaI/O Manual 86
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 (Part# KT122) that includes four metal straps, four #4-40 screws,
and a 5” RJ45 RS-485 interconnect cable (Part# 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 and 5).
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.
Modules greater than ten feet apart must have separate power supplies. Refer to the Power
Options section of this manual for recommendations.