Impulse 520W - Manual (Page 7)

SeaI/O Hardware Description
SeaI/O Base and Expansion Modules
Base Modules connect to the host via one of the following interfaces:
W-Series – Wireless Modbus TCP
E-Series - Ethernet Modbus TCP
U-Series - USB Modbus RTU
M-Series - RS-485 Modbus RTU
S-Series - RS-232 Modbus RTU
After the Base unit is installed, up to 246 additional SeaI/O N-Series Expansion
Units can be added to create an I/O network. These expansion modules interface via
RS-485 and can be located local to the Base SeaI/O device or remotely located up to
4000 feet away. Local installations should use the 5” CAT5 RS-485 pass-through
cable (Item number CA239) shipped with each N-series module to connect. Remote
expansion modules should use RS-485 twisted pair wiring from the Base unit
connected via the removable screw terminal connector.
For local installations power to the expansion modules is supplied from the Base unit
via the pass-through connectors. For remote devices, separate power is required at
each expansion unit. Refer to the Power Options section of this manual for more
information on SeaI/O power requirements and power supply sizing.
© Sealevel Systems, Inc. - 4 - SeaI/O User Manual