Hardware reference guide

Chapter 2: The Hardware
The Tether Port
20
7535 Hardware Reference Guide
• Psion Teklogix ScanSee, a scanner and input device which can be worn on
the back of the hand.
The tether port on the 7535 accepts an eight-pin custom connector:
Figure 2.5 Tether Port Connector
A mating connector is available from Psion Teklogix with part number 1020060.
The 7535 distinguishes between devices connected to the tether port by reading the
resistance between pin 8 and pin 5 of the tether port. These resistance values are as
follows:
Tether ID Resistor Value (Ohm) Connected Device
1 150k USB
2 59k
3 34.8k Serially-connected RFID device
4 23.2k
5 16.2k Generic serial device
611.8k
7 8.66k Non-decoded scanner
8 6.34k
9 4.53k Decoded serial scanner
10 3.01k
11 1.82k Psion Teklogix ScanSee
12 825