November 16, 2006 6881094C31-E
3-34 Theory of Operation: VOCON Board
3.2.4.4 Universal Connector Interface Circuitry
See Figure 8-63, “NTN9564B VOCON Universal Connector Circuit,” on page 8-97 for schematic
details of the following discussion.
Some important components on the universal connector interface are two op-amps. The first op-
amp, U201, is used as a comparator for the option-select 1 line. The comparator threshold is
determined by the voltage-divider network of R257 and R258. Similarly, the other op-amp, U202, is
used as a comparator for the option-select 2 line. The comparator threshold is determined by the
voltage-divider network of R240 and R243. The remaining components consist of current-limiting
serial resistors and noise-suppressing shunt capacitors.
3.2.4.4.1 Universal Connector and Option Selects
The universal connector is located on the side of the radio. It is the external port or interface to the
outside and is used for programming and interfacing to external accessories. The universal
connector connects to the VOCON board at connector J101 via a flex circuit that is routed inside the
external housing. Connections to the universal connector and J101 on the VOCON board are shown
in Figure 3-10 on page 3-34 and Figure 3-11 on page 3-34.
Figure 3-10. Universal (Side) Connector
Figure 3-11. VOCON Board Connector—J101
OPT_SEL1
EXT_MIC
OPT_SEL2
RTS
SB9600_BUSY
RS232_DOUT/USB_D+
EXT_SPKR
12
13
1
2
OPTB+/VPP
SPKR_COM
GND
CTS
RS232_DIN/USB_D-
SB9600_DATA/KEYFAIL
MAEPF-27415-O
135
37 35
39
36
38
40
2
4
6
J101
OPT_SEL1
EXT_SPKR
EXT_MIC
OPTB+/VPP
OPT_SEL2
SPKR_COM
RTS
GND
SB9600_BUSY
CTS
RS232_DOUT/USB_D+
SB9600_DATA/KEYFAIL
RS232_DIN/USB_D-
11
9
13
12
7
5
10
3
8
1
6
2
4
Signal Name J101-Pin #
MAEPF-27452-O
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