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LIT90410
PURPOSE:
This document describes the RS-232 commands that will operate the STT 2.0 Twin Tuner
through the 9-pin RS-232 connector on the rear panel.
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:
ff
O
r
e
w
o
P
=
0
X
,
n
O
r
e
w
o
P
=
1
X
1
,
0
T:
2
r
e
n
u
T
=
2
T
,
1
r
e
n
u
T
=
1
T
2
,
1
B:
M
F
=
2
d
n
a
B
,
M
A
=
1
B
2
,
1
P:
d
e
t
c
e
l
e
S
t
e
s
e
r
P
o
N
=
)
s
u
t
a
t
s
r
o
f
t
s
u
j(
0
0
P
,
0
3
t
e
s
e
r
P
=
0
3
P
,
1
t
e
s
e
r
P
=
1
0
P
0
3
-
0
0
F:
M
F
5
.
4
0
1
=
5
4
0
1
F
,
M
A
0
9
8
=
0
9
8
0
F
s
r
e
b
m
u
n
4
A:
p
U
k
e
e
S
=
1
A
,
n
w
o
D
k
e
e
S
=
0
A
1
,
0
M:
p
e
t
s
1
p
U
p
e
t
S
=
1
M
,
p
e
t
s
1
n
w
o
D
p
e
t
S
=
0
M
1
,
0
S:
d
il
a
v
n
i
=
1
0
S
,
o
e
r
e
t
s
o
n
,
l
a
n
g
i
s
o
n
=
)
s
u
t
a
t
s
r
o
f
t
s
u
j(
0
0
S
/
k
c
o
L
l
a
n
g
i
S
)
o
e
r
e
t
s
(
k
c
o
l
l
a
n
g
i
s
=
1
1
S
,
)
o
n
o
m
(
k
c
o
l
l
a
n
g
i
s
=
0
1
S
e
c
n
e
s
e
r
P
o
e
r
e
t
S
Q:
2
r
e
n
u
T
f
o
s
u
t
a
t
S
=
2
Q
,
1
r
e
n
u
T
f
o
s
u
t
a
t
S
=
1
Q
s
u
t
a
t
s
y
r
e
u
Q
2
n
e
h
t
1
,
s
r
e
n
u
t
h
t
o
b
f
o
s
u
t
a
t
S
=
3
Q
r
e
n
u
t
f
o
N:
t
e
s
e
r
P
1
p
U
p
e
t
S
=
1
N
,
t
e
s
e
r
P
1
n
w
o
D
p
e
t
S
=
0
N
1
,
0
L:
1
#
t
e
s
e
r
P
s
a
n
o
it
a
t
S
t
e
S
=
1
0
L
0
3
-
1
0
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
STT 2.0 DIGITAL AM/FM TWIN TUNER
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
RS-232 COMMANDS
Preset #
Frequency Setting
Seek Up / Down
Step Up / Down
Set Preset
The serial bus 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 #
External Unit
STT 2.0 RS-232 Port
RS-232 Commands
