MagTek PORT POWERED SWIPE READER - Manual (Page 9)

Section 1. Features and Specifications
3
Pin numbers and signal descriptions for the 9-pin (DE9) cable and 25-pin (DB25) adapter shown
in the illustration are listed in Table 1-1.
Table 1-1. 9-Pin Connectors and 25-Pin Adapter
25-pin
Adapter
DE9-pin
Connector
Signal
- 1 NC*
3 2 RXD (to PC)
2 3 TXD** (from PC)
20 4 DTR (from PC)
7 5 GND
- 6-9 NC*
* No Connection
** Pin must be connected to TXD (or DTR if TXD not available).