Transmit Ports; R0 And R1 Data Formats - FreeFlight 2101 I/O Approach Plus Installation And Checkout Manual

B.6

TRANSMIT PORTS

B.6.1 Configuration
Transmit Ports 1 and 2 (TXD1 and TXD2) provide interface capability with a variety of peripheral devices such as
moving maps and fuel flow computers, as well as providing data to users for custom applications. Adapters are
available for each port to provide RS-422 and/or RS-232 signals. No hand-shaking lines are provided.
Six data formats are available for use and may be selected in the INSTALL submode of the AUX mode (See Section
B.4). These formats are RNAV 0 and 1 (R0 and R1), King 0 and 1 (K0 and K1), and Extended King 0 and 1 (X0 and
X1). Formats R0 and R1 may be set to any baud rate (from 1200 baud to 38.4 kbaud, excepting 19.2 kbaud) while
formats K0, K1, X0, and X1 may only be set to 9600 baud or 38.4 kbaud. The update rate may be set from 1 to 999
seconds for any of the formats. The only exception is if the baud rate is 1200. For this case, the maximum update
rate is 2 seconds.
The data stream is a string of ten-bit serial ASCII characters consisting of one start bit, eight data bits, and one stop
bit. No parity is generated.
Data messages begin with an ASCII Start of Text (STX) character and end with an End of Text (ETX) character. A
single alphabetic character precedes each data element.
The data output format is as follows: <STX><id><dddd><it><id><dddd><it>....<id><dddd><it><ETX>
Where: STX =
id =
dddd =
it =
ETX =
B.6.2

R0 and R1 Data Formats

Data output is identical for both formats with the exception of the end of line codes. R0 is output with a carriage return
(CR) denoting the end of the line. R1 is output with both a carriage return (CR) and a line feed (LF) at the end of a
line.
Revision E
May 31, 2006
FreeFlight 2101 I/O Approach Plus GPS Navigation System
ASCII Start of Text Character
Item Designator (Single Alphabetic Character)
Item Data
Item Terminator: (CR) or (CR)(LF)
ASCII End-of-Text Character
Page B-7