Samsung SSA-S3020 ユーザーズマニュアル
English
English _ 15
INSTALLATION AND EXTERNAL CONNECTION
CONNECTING THE TERMINATION RESISTOR AND DIODE
A resistor is inserted for line’s impedance matching to prevent distortion and reduction in RS-422 or RS-485 long distance
data communications, which is referred to as termination resistor.
data communications, which is referred to as termination resistor.
Note that termination resistors of lower than 90 are not allowed, neither more than one termination resistor is accepted
for the communications system.
for the communications system.
BYPASS DIODE CONNECTION
If you connected an inductor (door locks or alarm device) to the output relay, there should occur a surge voltage while the
inductor was turning on and off. If you do not connect a bypass diode to the relay, the surge voltage will cause damage to
the electric circuit of the controller. To reduce this surge, it is recommended to connect a bypass diode between the
devices.
inductor was turning on and off. If you do not connect a bypass diode to the relay, the surge voltage will cause damage to
the electric circuit of the controller. To reduce this surge, it is recommended to connect a bypass diode between the
devices.
1
3
2
6
5
4
7
7
9
8
ESC
0
ENT
F
1
F
2
F
3
F
4
F
5
F
6
F
7
F
8
F
9
F10
F11
F12
Mon 12 / 12 / 2009
10 : 30 : 20
183
"-.
%003
Lock/Alarm
GND(-)
DC12V
Cathode
Anode
1N4004~1N4007 or equiv.
1
3
2
6
5
4
7
7
9
8
ESC
0
ENT
F
1
F
2
F
3
F
4
F
5
F
6
F
7
F
8
F
9
F10
F11
F12
Mon 12 / 12 / 2009
10 : 30 : 20
183
"-.
%003
"
#
A
B
120Ω
120Ω
RS485/RS232
Converter
Termination Resistors
RS-485
RS-485