Motorola GM1200E Installation Manual page 19

Pin Function
11 Flat_RX_Audio
(NPD Data In)
12 Programmable
Output (CTS)
13 SW_B+ sense
(Analogue
Ground)
14 Hook (Clear)
15 RSSI
16 External
Speaker +
Note 1 : Digital Input
4.7 kΩ Internal Pull Up Resistor to +5V.
Maximum Input Voltage accepted as Low = 0.6V
Minimum Input Voltage accepted as High = 3.0V
Note 2 : Digital Output
4.7kΩ Internal Pull Up Resistor to +5V
Maximum Current when Output Low = 10mA
Maximum Voltage when Output Low = 0.5V @ 10mA
Note 3 : High Current Digital Output
4.7kΩ Internal Pull Up Resistor to continuousB+
Maximum Current when Output Low = 200mA
Maximum Voltage when Output Low = 1.7V @200mA
Note 4: Low current Digita; Output
No internal Pull Up resistor
Maximum Current when Output Low = 1mA
Maximum Voltage when Output Low = 1V @ 1mA
Note 5: Digital Input
3.3kΩ Internal Pull Up Resistor to continuousB+
Should be connected to an open drain or open collector
Radio Installation
The signal routed to this pin is controlled by ASFIC and gives continuous discrim-
inator audio. For discriminator audio, the nominal ouput level is 330mVRMS for
60% deviation. The impedance is 600ohms.
This digital output function depends on dealer programming. The DPS details
which functions may be assigned to this pin by the codeplug.
(See Notes 2).
This voltage is available when the radio is switched on.
The current limiting resistor R0425 default is 22 ohms.
(See Caution 2)
This hook line is in parallel to the hook line of the control head microphone con-
nector. This port reads '0' when the microphone is on-hook and '1' when the
microphone is off-hook. It is assumed that the hook is a mechanical switch, so
the software will always debounce this input.
Also available on the microphone connector pin 3.
This is an analog output which indicates the strength of the received signal.
Positive output of radio's audio PA (see Pin 1).
Accessory Connector Pin Functions
Description
1-13