FreeFlight 2101 I/O PLUS, Installation And Checkout Manual

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Page B-2
Revision E
May 31, 2006
FreeFlight 2101 I/O Approach Plus GPS Navigation System
B.3 CONNECTOR PIN ASSIGNMENTS
All interface connections are provided on a 37-pin connector. The following table defines pin numbers, functions, and
descriptions for all serial interface pins utilized on the FreeFlight 2101 I/O Approach Plus.
PIN
NUMBER
FUNCTION DESCRIPTION
1 Serial Common Ground Reference for RS-232/423 -- See Note 2
2 RXD3+ Receive Port #3 (RS-422) -- See Note 1
4 TXD3BP Transmit Port #3 (RS-232/423) -- See Note 1
5 TXD1- Transmit Port #1 (RS-422)
6 TXD1BP Transmit Port #1 (RS-232/423)
7 RXD1+ Receive Port #1
8 RXD1- Receive Port #1
9 TXD2- Transmit Port #2 (RS-422)
10 TXD2BP Transmit Port #2 (RS-232/423)
18 RXD3- Receive Port #3 -- See Note 1
23 TXD2+ Transmit Port #2 (RS-422)
24 RXD2+ Receive Port #2
29 TXD3+ Transmit Port #3 (RS-422) -- See Note 1
35 TXD3- Transmit Port #3 (RS-422) -- See Note 1
36 RXD2- Receive Port #2
37 TXD1+ Transmit Port #1 (RS-422)
Notes:
1. Serial port 3 is reserved for Differential GPS operation.
2. Terminate shields on pins 3 or 20 (Aircraft Ground).