
Appendix A: Port Pinouts
Te t h e r P o rt P i n o u t
Psion Teklogix 7535 G2 Hand-Held Computer User Manual A-3
A.1 Tether Port Pinout
The tether port connector incorporates multiplexed undecoded scanner, decoded scanner,
RS-232 serial, and USB interfaces. In order for it to operate, a special wiring scheme is
needed. If you have a need to create cables for the tether port, contact a Psion Teklogix rep-
resentative and request document #1010032 “Instruction Tether Port Termination”.
Attempting to interface to the tether connector without following this document may cause
damage to the 7535 G2 or the tethered device.
A.2 Docking Station Connector
1. Ext 5V Switched. Used by external peripherals. 5VDC, 1A max.
2. RS-232 Rx Data. Console receive pin.
3. RS-232 Tx Data. Console transmit pin
4. DC Power In (13 - 18VDC @ 3A max). External power adaptor positive input.
5. USB Host Minus. For connecting USB devices.
6. USB Host Plus. For connecting USB devices.
7. DC Power In. Same as pin 4.
8. Docking Station ID. Identifies device attached to the docking station connector. The
external device applies a specific resistance between this pin and ground as
identification.
9. Ground.
10. USB Device Minus. Connects to another USB host, such as a PC.
11. USB Device Plus. Connects to another USB host, such as a PC.
12. Ground.
2 4 6 8 10 12
1 3 5 7 9 11
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