ATR833-II-BOX / P/N 833-II-(Mxxx)-(Mxxx)
Operation and Installation
Doc-No. 01.143M.010.71e
8
Doc.-No. 01.143.010.71d/e ATR833-II - Operation and Installation
Doc.-No. 01.1313.010.71d/e ATR833S
– Operation and Installation
The above mentioned manuals can be downloaded from service
webpage of f.u.n.k.e. AVIONICS:
www.funkeavionics.de/en/service/manuals/
4 CONFIGURATION
The configuration of the ATR833-II BOX is identical to the ATR833-II
transceiver. See §3 of the Operation and Installation Manual.
All setting commands and acknowledgements are performed via the
remote control interface. The protocol scheme is described in the
following chapter.
4.1 Remote Interface
The remote control interface is a serial RX-TX interface with RS232
voltage levels with 9600 baud, 8 data bits, no parity, 1 stop bit, no
handshake.
Each message begins with 2 byte sequences 0x02 (STX) and 0x72 ('r')
for synchronization followed by a message identification-byte and a
different number of data bytes.
Byte #
Value
Description
1
0x02 (STX)
Synchronization
2
0x72 (‘r’)
Synchronization
3
id
id
of message
4…3+
n
n data bytes
depending on message
4+
n
checksum
XOR of bytes #2 … #3+
n
i.e. excluding the STX and the checksum itself
Byte stuffing
If the STX byte (0x02) appears in the data byte of a message, this byte is
doubled to distinguish it from STX. The checksum then contains both
0x02 values.
The standby frequency is set with the ID 0x12 and contains two data
bytes:
