PV-4000-5V-S: "+5V Only option"

+5V only"-version of PV-4000-S.

The 5V Only (-5V) option can be specified for PV-serial boards with one or more RS232 ports. When it is specified, the board only requires +5V power from the PC/104 bus. When it isn't specified, both +5V, +12V, and -12V are required from the PC/104 bus for the RS232 ports to work.