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
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
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).
Summary of Contents for MD78X
Page 1: ...DIGITAL MOBILE RADIO SERVICE MANUAL...
Page 5: ...UHF1 400 470 MHz...
Page 14: ...UHF1 400 470 MHz Exploded View and Packing Guide 7 3 2 Packing Guide...
Page 62: ...55 9 PCB View MD78X MD78XG PCB View Front Panel Top Layer...
Page 63: ...56 MD78X MD78XG PCB View Front Panel Bottom Layer...
Page 64: ...MD78X MD78XG PCB View Main Board Top Layer 57...
Page 65: ...MD78X MD78XG PCB View Main Board Bottom Layer 58...
Page 111: ...UHF2 450 520 MHz...
Page 120: ...UHF2 450 520 MHz Exploded View and Packing Guide 7 3 2 Packing Guide...
Page 167: ...54 9 PCB View MD78X MD78XG PCB View Front Panel Top Layer...
Page 168: ...55 MD78X MD78XG PCB View Front Panel Bottom Layer...
Page 169: ...MD78X MD78XG PCB View Main Board Top Layer 56...
Page 170: ...MD78X MD78XG PCB View Main Board Bottom Layer 57...
Page 216: ...UHF3 350 400 MHz...
Page 225: ...UHF3 350 400 MHz Exploded View and Packing Guide 7 3 2 Packing Guide...
Page 272: ...54 9 PCB View MD78X MD78XG PCB View Front Panel Top Layer...
Page 273: ...55 MD78X MD78XG PCB View Front Panel Bottom Layer...
Page 274: ...MD78X MD78XG PCB View Main Board Top Layer 56...
Page 275: ...MD78X MD78XG PCB View Main Board Bottom Layer 57...
Page 321: ...UHF5 806 941 MHz...
Page 330: ...UHF5 806MHz 941MHz Exploded View and Packing Guide 7 3 2 Packing Guide...
Page 376: ...53 9 PCB View MD78X MD78XG PCB View Front Panel Top Layer...
Page 377: ...54 MD78X MD78XG PCB View Front Panel Bottom Layer...
Page 378: ...55 MD78X MD78XG PCB View Main Board Top Layer...
Page 379: ...56 MD78X MD78XG PCB View Main Board Bottom Layer...
Page 414: ...VHF 136 174 MHz...
Page 423: ...VHF 136MHz 174MHz Exploded View and Packing Guide 7 3 2 Packing Guide...
Page 468: ...PCB 52 9 PCB View MD78X MD78XG PCB View Front Panel Top Layer...
Page 469: ...PCB 53 MD78X MD78XG PCB View Front Panel Bottom Layer...
Page 470: ...MD78X MD78XG PCB View Main Board Top Layer 54...
Page 471: ...PCB 55 MD78X MD78XG PCB View Main Board Bottom Layer...