Appendix B: Port Pinouts
Ports Diagram
B-3
Psion VH10 Vehicle-Mount Computer User Manual
B.1
Ports Diagram
Figure B.1
VH10 Bottom View (cable bay cover off)
B.2
Serial Ports Interface Pinout (UART RS-232)
Warning:
To maximize battery run time, when the VH10 is not on vehicle or AC power, it enters
into UPS Battery Power mode which limits the powered external ports to a total of 1A
(see also “Power Saving Suspend” on page 70).
Audio jack
USB host port
UART RS-232 ports
Powered USB host port
Power cable
Ground lug
Beeper
Cable bay
Strain relief
brackets
Vent
Table B.1
RS-232 Pinout*
Signal #
Function
Signal
Type
Notes
1
RS-232 Serial Port Data Carrier
Detect
DCD
RS-232D
2
RS-232 Serial Port Receive Data
RXD
RS-232D
3
RS-232 Serial Port Transmit Data
TXD
RS-232D
4
RS-232 Serial Port Data Terminal
Ready
DTR
RS-232D
5
Ground
GND
Power
6
RS-232 Serial Port Data Set Ready
DSR
RS-232D
7
RS-232 Serial Port Ready to Send
RTS
RS-232D
Loopback for screen-blanking
8
RS-232 Serial Port Clear to Send
CTS
RS-232D
Loopback for screen-blanking
9
Power Output
Power
Switched 5V @ 1000mA max
(**see Warning on page B-4)
* Signal definitions are with respect to the VH10 Vehicle-Mount Computer side.
