MD280/MD280N User Manual Mechanical and Electrical Installation
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Type Terminal
Terminal
Name
Function Description
Analog
output
AO-GND
Analog Output
1
The voltage or current output is determined by
jumper J3 on the control panel.
Output voltage range: 0V to 10V
Output current range: 0mA to 20mA.
Type Terminal
Terminal
name
Function description
DO1-COM
DO2-COM
Digital output
Optical coupling isolation,dual polarity open
collector output
Output voltage range: 0V to 24V
Output current range: 0mA to 50mA
Digital
Output
FM-COM
High-speed
pulse output
When it is used as high-speed pulse outputˈthe
maximum frequency can reach 50kHz;
When it is used as open collector output, it is the
same as DO1 in terms of specification.
Caution:The function of AOˈFMˈDO3 share the
channel,only one of which can be selected.
T/A-T/B
Normally
closed terminal
Relay
output
T/A-T/C
Normally open
terminal
Contact driving capacity:
AC250V,3A,COSij=0.4DŽ
DC 30Vˈ1A
A+/A-
485
communication
port
Standard 485 interface
Auxiliary
interface
Keypad
External
keyboard
interface
Standard RJ45 network cable interface, used to
provide signals for the external keyboard.
3) Description of wiring of control terminals:
A. Analog input terminal:
Because the weak analog signal will be easily affected by the
external interference, generally shielded cable shall be used, and the cable
length shall be as short as possible and no longer than 20 meters, as
shown in Fig.3-9, In case the analog signal is subject to severe interference,
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