Universal Connector Interface Circuitry; Figure 4-4. Universal (Side) Connector; Figure 4-5. Vocon Board Connector-J101 - Motorola ASTRO XTS 5000 Detailed Service Manual

4-22

4.3.4.3 Universal Connector Interface Circuitry

See Figure 9-12. VOCON Universal Connector Circuit on page 9-18
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.
4.3.4.3.1 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 4-4 and
Signal Name
OPT_SEL1
EXT_SPKR
EXT_MIC
OPTB+/VPP
OPT_SEL2
SPKR_COM
SB9600_BUSY
RS232_DOUT/USB_D+
SB9600_DATA/KEYFAIL
RS232_DIN/USB_D-
April 15, 2002
Figure 4-5.
OPT_SEL1
EXT_MIC
OPT_SEL2
RTS
SB9600_BUSY
RS232_DOUT/USB_D+
SB9600_DATA/KEYFAIL

Figure 4-4. Universal (Side) Connector

J101-Pin #
11
9
13
12
7
5
RTS 10
GND 3
8
CTS 1
6
2
4
Figure 4-5. VOCON Board Connector—J101
Detailed Theory of Operation
1
2
EXT_SPKR
OPTB+/VPP
SPKR_COM
GND
CTS
RS232_DIN/USB_D-
12
13
MAEPF-27415-O
J101
39 37 35
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
40 38 36
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
: VOCON Board
for schematic details of the
5 3 1
4
6 2
MAEPF-27452-O
68P81094C31-O