Hytera MD78X Service Manual

Interface Definition
UHF3 (350
–
400 MHz)
38
Pin
No.
Name Type
Signal Electrical
Performance
Description
7 Mic input Analog input
Modulation sensitivity
Vrms=80mV±10%@1kHz
60%system max. deviation
Mic input for palm microphone
8 USB_D+
USB data
cable+
USB data
When this pin is used for USB
function, USB function of DB26
will be disabled.
9 HOOK Digital input 3.3V CMOS
High level by default; valid at low
level.
HOOK and MONITOR functions:
Press this key, the level
changes from high to low. When
palm microphone is detected or
press the key of the palm
microphone, this pin is used for
HOOK function; when desktop
microphone is detected, this pin
is used for MONITOR function.
10
Accessory
identification
interface 2
Digital input 3.3V CMOS
Pin 1 and Pin 10 (accessory
identifier interface 1) compose
an accessory identification
matrix.
Please refer to the
“10-
pin Accessory Identification
Matrix Table” below for detailed
function definitions.
10-pin Accessory Identification Matrix Table (composed of Pin 1 and Pin 10):
Pin 1 Pin 10 Radio Status
Low level Low level Reserved
Low level High level
The mobile radio is in USB master mode or connected to a USB
smart accessory (such as palm microphone with keypad).
High level Low level
The mobile radio is connected to an external speaker (including

Hytera MD78X Specifications

General

Brand	Hytera
Model	MD78X
Category	Radio
Language	English