Hytera MD78X - Page 157

Interface Definition
UHF2 (450
–
520 MHz)
44
Pin No. Name Description
28 RESET Reset signal
29 IM3
Select data cable
30 IM0
31 LEDA LED anode
32 LED_K1
LED cathode
33 LED_K2
34 LED_K3
J4 (Aviation Interface of Front Panel)
Pin No. Name Description
1 ACC_IO1 Digital input
2 PTT_IN Digital input
3 External_Audio Analog output
4 USB_D- USB data cable
5 GND Ground cable
6 USB_VBUS Power supply
7 MIC_IN Analog input
8 USB_D+ USB data cable
9 HOOK Hook signal input
10 ACC_IO2 Digital input
J400 (Option Board Interface)
Pin No. Signal Function
I/O of the
Radio
Voltage
(Option Board
VDD=3.3 V)
Remark
1 GPIO1
GPIO
I/O
VIH MIN=0.7VDD
VIL MAX=0. 3VDD
VOH MIN=0.8VDD
VOL MAX=0.22VDD
GPIO5: output signal of
re
setting the option
board.
GPIO4/GPIO5:
3 GPIO2
5 GPIO3
7 GPIO4 O