2 RS-232 COMMANDS
3
General Information:
Data Rate:
19,200 baud
Parity:
None
Word length:
8 data bits, 1 stop bit
Handshake:
No RTS/CTS handshaking
Connections:
simple 3 wire (Rx, Tx, Gnd) interface
Data Entry Protocol:
Command Codes:
Character
Range
Example
X:
0,1
X1 = Power On, X0 = Power Off
T:
1,2
T1 = Tuner 1, T2 = Tuner 2
B:
1,2
B1 = AM, Band 2 = FM
P:
00 - 30
P01 = Preset 1, P30 = Preset 30, P00 (just for status) = No Preset Selected
F:
4 numbers
F0890 = 890 AM, F1045 = 104.5 FM
A:
0,1
A0 = Seek Down, A1 = Seek Up
M:
0,1
M0 = Step Down 1 step, M1 = Step Up 1 step
S:
Signal Lock /
S00 (just for status) = no signal, no stereo, S01 = invalid
Stereo Presence
S10 = signal lock (mono), S11 = signal lock (stereo)
Q:
Query status
Q1 = Status of Tuner 1, Q2 = Status of Tuner 2
of tuner
Q3 = Status of both tuners, 1 then 2
N:
0,1
N0 = Step Down 1 Preset, N1 = Step Up 1 Preset
L:
01 - 30
L01 = Set Station as Preset #1
Command Examples:
T1B2P01<cr> would command tuner #1 to select band 2 (FM) and tune to FM preset #1
T2B1F1070L03<cr> would command tuner #2 to set AM frequency 1070 kHz as AM preset #3
This command however, would not change the current station tuned on Tuner #2
To select a station to be tuned and
THEN set that station as a preset, would require two commands:
T2B1F1070<cr> would command tuner #2 to select band 1 (AM) and tune to frequency 1070 kHz.
T2L03<cr> would command tuner 2 to set the currently tuned station (in this example AM 1070) as AM preset #3
Query Example:
Q1<cr> would solicit the following response:
Feedback as to the status of tuner #1, which would include band select, station preset, frequency
tuned, signal lock and stereo presence. The response string would look like this:T1B2P00F1011S11
T1 (tuner 1) B2 (FM), P00 (no preset selected), F1011 (frequency 101.1 MHz), S11 (signal lock & stereo)
Shortcut Commands:
Note: examples below are assuming Tuner 1 is in FM stereo mode and tuned to a station
Command
T1N1<cr>
T1L01<cr>
T1S10<cr>
T1M1<cr>
T1A0<cr>
T1B1<cr>
1 = locked, 0 = not
Tuner 1 would go to AM mode and tune to the last previously tuned AM station
Tuner 1 would step up to the next higher preset number
Tuner 1 would set the currently tuned station as FM preset #1
Tuner 1 would switch the FM mode to mono
Tuner 1 would step up the frequency 0.2 MHz
Response/Action
Tuner 1 would go into "seek down" mode
Preset #
Frequency Setting
Seek Up / Down
Step Up / Down
Set Preset
The serial buss should follow a standard serial communications protocol using Line
oriented ASCII data stream. The command line must be followed with a carriage
return for the unit to respond. The unit should not echo characters received back
to the host.
1 = stereo, 0 = mono
ask for tuner status
Preset Step Up / Down
Function
Power Off / On
Tuner #
Band #
