Hytera MD78X Service Manual

UHF1 (400
–
470 MHz)
Interface Definition
41
Pin
No.
Name Type
Signal Electrical
Performance
Description
three a
ccessory identification
statuses.
Please refer to the
“
DB26 Accessory Identification
Matrix Table”
below for detailed
function definitions.
14 Emerg Sw Digital input 5V TTL
Emerg
ency switch. This pin is
valid when low level is input.
15 ACC_IO3 Digital input 5V TTL
Accessory identification interface;
high level by default. This pin and
Pin 13 (ACC_IO2) can compose
three accessory identification
statuses. Please refer to the
“
DB26 Accessory Identification
Matrix Table”” below for detailed
function definitions.
16 PRGM_IN_PTT Digital input 5V TTL
Programmable input pin (PTT
key of external Mic by default; its
function is programmable via
CPS). It is valid at low level.
17 Audio Ground
Audio
(grounding)
/ /
18 SPK+
Analog
signal
output
It forms differential output
together with SPK-
. Max
power output: 10 W(R=8
Ω)
External speaker output+
19 D-
USB data
cable-
USB data USB data cable-
20 GP5_8
Digital
input/output
5V TTL GPIO. Programmable via CPS.
21 Ground
Ground
/ /

Hytera MD78X Specifications

General

Brand	Hytera
Model	MD78X
Category	Radio
Language	English