Pin 10, the Vpp/CTS pin, also serves several func-
tions. When reprogramming the Flash memory device,
this pin carries the programming voltage, Vpp. The pin is
also used to identify that a key-variable loader is
attached. The KVL cable will ground this pin.
Pin 11, the BOOT PGM RX/TX DATA pin, is used
for receive data during bootstrap programming, typically
when reprogramming the Flash. Unlike normal SB9600
communications, bootstrap mode requires separate
receive and transmit data paths.
Pin 12, MODE CNTRL, is used to identify that a
“special” device is connected. Typically this will be the
key-variable loader. Typically, the microcontroller will re-
program MUX CNTL high when this pin is low. The
key-variable loader cable also grounds this pin.
Pin 13, LH DATA/ (KEY/FAIL), serves several func-
tions as well. During normal radio operations, this pin is
used as the bi-directional SB9600 data pin. When the
key-variable loader is attached, this pin carries the bi-
directional KEY/FAIL signal from the KVL. When the
radio is in bootstrap mode, typically during Flash pro-
gramming, this pin is used for transmit data. Unlike
normal SB9600 communications, bootstrap mode
requires separate receive and transmit data paths.
29
Table 2. Option Select Definition
Table 3. Universal Connector Mode
MODE# MODE OPT OPT COMMENT
SEL 1 SEL 2
00 External PTT 0 0
01 External Audio 0 1 External Speaker
10 Mandown 1 0
11 Normal 1 1
Operation
A MTVA Fixed Audio
Output Level
B “Smart” Identifies
SB9600 SB9600 Accy.
Accessory
C External RF Enables AUX
Modem/FAX TX and Discriminator
Audio Output
OPTION B+ MODE CONTROL MODE
NC or Load No Connection Normal
NC or Load Ground Special
>12 Volts No Connection Bootstrap Program
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