Hytera MD78X - Page 455

VHF (136MHz
–
174MHz)
Interface Definition
39
Pin
No.
Name Type
Signal Electrical
Performance
Description
default. This pin and Pin 15
(ACC_IO3) can compose
three accessory
identification statuses.
Please refer to the “DB26
Accessory Identification
Matrix Table
” below for
detailed function definitions.
14 Emerg Sw Digital input 5V TTL
Emergency 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+