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14 - 4 Dolphin® 7900 Series Mobile Computer User’s Guide
RS-232 Serial Communications Port
Use a standard serial cable to connect to the host device via RS-232. The following diagram displays the pin
diagram of the serial connector of the bottom panel of the Mobile Base.
Signals referenced are for a DTE device.
The Mobile Base connector is straight to the printed circuit board (PCB). The ninth pin sends 500mA at 5 Volts
power out. This can power a peripheral device, such as a mobile printer, as long as that peripheral device can
accept 500mA at 5 Volts.
Pin # Description
1 Internal Jumper to Pin 6
2 TXD
3 RXD
4 DSR
5 GND
6 DTR
7 CTS
8RTS
9 5 VOLT OUT