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ATON AH66T INSTALLATION MANUAL
© ATON 2010 | All rights reserved. Page 72
Tuner Command Structure
AH66T tuner commands follow the same basic structure. Commands are in all capitals and
the comma separation (44 in decimal or 0x2C in hex) is required.
Prefix: &AH66 - This is required for all command strings.
Tuner Select (TS): This is required for all command strings. This selects either
chassis one’s tuner or chassis two’s tuner.*
*Radio 2 (R2) is only available in a two chassis system that has been configured to
share tuners. See page 33 for information on the internal tuner setup options.
Parameter # 1 (PAR1): This refers to the desired function. (Scan, Seek, Cancel, etc.)
Parameter # 2 (PAR2): This is usually the second part of the actual command - ON / OFF /
TOGGLE / QUERY / UP / DOWN, for example.
Parameter # 3 (PAR3): Used when direct tuning the internal radio or requesting RDS
metadata.
Carriage Return (<cr>): This is required for all commands. (0x0d or Decimal 13)
Sample Command Layout:
&AH66,TS,PAR1,PAR2<cr> (2 parameters)
&AH66,TS,PAR1,PAR2,PAR3<cr> (3 parameters)
Tuner Command Response Structure
When a tuner command is sent the AH66T will generate a response that indicates whether
or not the command was successfully decoded.
When the AH66T successfully decodes tuner commands it will respond with *AH66,ACK.
If the tuner command is not successfully decoded (incorrect command or format) the
AH66T will respond with *AH66,NACK.