Specifications

232SPS2-0812 Manual Chapter 4: Power Connections 7
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
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CHAPTER 4: POWER CONNECTIONS
The unit may be port-powered using DTR and RTS on the serial
port. If the 232SPS2 cannot be powered using the handshake lines,
it may be powered externally using +7 to +18 volts DC at 2 milliamps.
If you are using an external supply, simply plug a 2.5 mm plug from
an appropriate DC source into the power jack on the side of the
232SPS2 module. Power supplies are available through B&B. (Model
232PS is recommended.)