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© Sealevel Systems, Inc.
SeaI/OUSBSERIAL | SL9177 04/2022
Power Options
All SeaI/O modules are powered from a 9-30VDC source using either the DC jack or screw terminals on the side
of the unit. Sealevel offers several power supply choices to make connection easy (see
the end of this manual).
If the SeaI/O USB serial exp
ansion module will be used alone, the recommended “single
-
unit” power supply
(Item# TR112) rated at 24VDC @ 250mA is a perfect fit. Skip ahead to the
manual.
One of the primary features of SeaI/O modules is their ability to be powered from a single input source, which is
then shared with other SeaI/O expansion modules via pass-through connectors or screw terminals located on
the left side of the modules. If you are connecting multiple SeaI/O modules together, refer to the rest of this
chapter for power supply sizing considerations.
SeaI/O Expansion Power Connection
Each SeaI/O product, including the expansion modules, contains an onboard switching regulator power supply
rated for 9-
30VDC. For local installations (less than 10’ apart), expansion module power is usually supplied from
the Base module via the pass-through connectors. The number of expansion modules that can be driven from
the Base module depends on the power source and number/type of expansion modules. Refer to the chart below
for power requirements. For expansion modules mounted remotely (greater than 10
’ apart), separate power is
required at each expansion module.
SeaI/O Expansion Power Requirements
The following table shows the maximum power requirements for each SeaI/O digital and analog expansion
module.
Model Number
Max Power
SeaI/O-410N
1.4W
SeaI/O-420N
2.0W
SeaI/O-430N
0.4W
SeaI/O-440N
2.5W
SeaI/O-450N
3.8W
SeaI/O-470N
1.5W
SeaI/O-520N
3.5W
