Hardware reference guide

7535 Hardware Reference Guide 19
Chapter 2: The Hardware
Pinouts And Cables
2.14 Pinouts And Cables
2.14.1 The Serial Port
The RS232 serial port on the 7535’s Portable Docking Module has the standard 9-
pin pinout; however, the PDM only passes the TxD, RxD, and Ground signals to the
7535’s docking connector. There is no hardware flow control.
The serial cable supplied is a 9-pin-to-9-pin null-modem cable, Psion Teklogix part
number 9003659.
The pinout of a standard 9-pin RS-232 connector is as follows:
Table 2.4 RS232 Pinout
2.14.2 The Tether Port
The 7535 can recognize several types of devices connected to its tether port. These
devices are as follows:
• USB device.
• serially-connected RFID reader.
• generic serial device.
• non-decoded scanner.
• decoded serial scanner.
Pin Function
1DCD
2RXD
3TXD
4DTR
5 Ground
6DSR
7RTS
8CTS
9RI