Hytera MD78X - Page 452

Interface Definition
VHF (136MHz
–
174MHz)
36
Pin
No.
Name Type
Signal Electrical
Performance
Description
7 Mic input Analog input
Modulation sensitivity
Vrms=80 mV±10%@1 kHz
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 10 and Pin 1 (accessory
identification interface 1)
compose an accessory
i
dentification 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).