Specifications

APPENDIX A: TECHNICAL SPECIFICATIONS
A - 9
Psion 9-to-25 way D-type adapters
- Technical Specification
The Psion series 3c and Psion Siena machines use a different type of communications cable from
preceding machines;- the Psion PC Link cable. To connect to other 25 way D-type connector devices,
adapters are needed as, unlike the 3Link cable, this is a single cable and can’t be split to change the RS-
232 half to connect to a serial printer or modem.
The new PC Link and 3Link cables use the pins on the D-type plugs in a unique way. This means that a
unique mapping from 9-to-25 way pinouts is required, so special adapters (i.e. non-industry standard)
have been designed to provide this unique mapping.
Except in special cases, these adapters replace the need for the old RS-232 serial printer and modem
cables for 3Link users. In addition, these adapters allow connection of a 3Link or PC Link cable to a PC
with 25 way communication ports.
The three types of Psion branded RS232 9-to-25 way D-type adapters allow any Psion cable with a 9 way
D-type connector to be connected to another machine with a IBM XT type PC 25 way D-type port or
modem or printer serial port.
Adapter Part number EMC Safety
Modem 1602 0016 01 FCC Part 15 Class B; CE Mark EN60950
Serial Printer 1602 0017 01 FCC Part 15 Class B; CE Mark EN60950
PC (XT) 1602 0015 01 FCC Part 15 Class B; CE Mark EN60950
Modem 9-to-25 way D-type adapter - wiring diagram
9 way D - male 25 way D - male
RX - pin 3 pin - 3
TX - pin 2 pin - 2
DTR - pin 6 pin - 20
GND - pin 5 pin - 7
DSR - pin 4 pin - 6
RTS - pin 8 pin - 4
CTS - pin 7 pin - 5
DCD - pin 9 pin - 8
SHELL pin - 1
SHELL
PC (XT) 9-to-25 way D-type adapter - wiring diagram
9 way D - male 25 way D - female
RX - pin 3 pin - 2
TX - pin 2 pin - 3
DTR - pin 6 pin - 6
GND - pin 5 pin - 7
DSR - pin 4 pin - 20
RTS - pin 8 pin - 5
CTS - pin 7 pin - 4
DCD - pin 9 pin - 7
SHELL pin - 1
SHELL