Motorola GM1200E Руководство по установке - Страница 19

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Function

Flat_RX_Audio

(NPD Data In)

Programmable

Output (CTS)

SW_B+ sense

(Analogue

Ground)

Hook (Clear)

RSSI

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