User's Manual

22 TM9100 (40W/50W) Installation Guide
© Tait Electronics Ltd October 2004
Shielding If the auxiliary cable is longer than 4 feet (1m) it is recommended to shield
the cable and connector backshell. Figure 2.4 shows the recommended
shielding arrangement. The earth braid wire (bare copper) and aluminium
foil should only be earthed at the radio end of the cable.
Table 2.2 Auxiliary connector (radio) - pins and signals
Pinout Pin Signal name Description Signal type
12 AUX_GPI1 General purpose digital
input. Programmable
function.
Digital,
3V3 CMOS.
5 AUX_GPI2
4 AUX_GPI3
10 AUX_GPIO4 Programmable function and
direction.
Pads available to fit a higher
power driver transistor on
GPIO4 line.
Digital, 3V3
CMOS input;
open collector
output with
pullup
2 AUX_GPIO5
9 AUX_GPIO6
1 AUX_GPIO7
11 AUX_TXD Asynchronous serial port -
Transmit data
Digital,
3V3 CMOS
3 AUX_RXD Asynchronous serial port -
Receive data
Digital,
3V3 CMOS
7 AUD_TAP_IN Programmable tap point into
the Rx or Tx audio chain.
DC-coupled.
Analog
13 AUD_TAP_OUT Programmable tap point out
of the Rx or Tx audio chain.
DC-coupled.
Analog
14 AUX_MIC_AUD Auxiliary microphone input.
Electret microphone biasing
provided. Dynamic
microphones are not
supported.
Analog
6 RSSI Analog RSSI output. Analog
8 +13V8_SW Switched 13.8V supply.
Supply is switched off when
radio body is switched off.
Power
15 AGND Analog ground Ground
rear view
J
B
C
D
E
F
G
H
I
1)
1!
1@
1#
1$
1%
Figure 2.4 Auxiliary cable and connector shielding
cable insulation
aluminum foil
earth braid wire
signal earth wire
analo
g
g
round pin
metal backshell
metal D-range shroud in
contact with backshell
metal cable clamp