Hytera MD78X Service Manual

VHF (136MHz
–
174MHz)
Interface Definition
35
7. Interface Definition
7.1 10-PIN Connector
The 10-pin connector on the front panel is used for audio accessories or data cable connection. The
definition of each pin is described as below.
Pin
No.
Name Type
Signal Electrical
Performance
Description
1
Accessory
identification
interface 1
Digital input 3.3V CMOS
Pin 1 and Pin 10 (accessory
identifier port 2) compose an
accessory identification matrix.
Please refer to the “
10-pin
Accessory Identification Matrix
Table
” below for detailed
function definitions.
2 PTT input Digital input 3.3V CMOS
PTT input for the palm
microphone, which is valid at
low level.
3
External audio
output
Analog
output
Load impedance>1 kΩ
Vrms=600 mV±10%@1
kHz
60% system max.
deviation
Accessory audio output. When
“Mic Audio Output” is selected
via CPS, this pin will output the
received audio signal.
4 USB_D-
USB data
cable-
USB data
When this pin is used for USB
function, USB functi
on of
DB26 will be disabled.
5 GND Ground cable / /
6 USB_VBUS
USB power
supply
Power supply: 5 V; current
limiting: 500 mA
This pin provides power
supply to the USB accessory.
It outputs a 5 V voltage when
accessory identification code
is 00|01|10, and
outputs low
level when the code is 11.

Hytera MD78X Specifications

General

Brand	Hytera
Model	MD78X
Category	Radio
Language	English