Hytera MD78X - Page 359

Interface Definition
UHF5 (806MHz
–
941MHz)
36
Pin
No.
Name Type
Signal Electrical
Performance
Description
level when the code is 11.
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 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