Bypass Diode Connection - Samsung SSA-S3010 User Manual

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.
Note that termination resistors of lower than 90— are not allowed, neither more than one termination resistor is accepted
for the communications system.
RS485/RS232
Converter

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.
Mon 01 / 01 / 2010
10 : 30 : 20
1 2 3
F 1 F 2 F 3
4 5 6
F 4 F 5 F 6
7 8 9
F 7 F 8 F 9
0
ESC ENT
F10 F11 F12
RS-485
120Ω
Termination Resistors
DC12V
GND(-)
Lock/Alarm
A
RS-485
Mon 01 / 01 / 2010
10 : 30 : 20
1 2 3
F 1
4 5 6
F 4
B 7 8 9
F 7
0
ESC ENT
120Ω
F10
Cathode Anode
1N4004~1N4007 or equiv.
English English _ 15
F 2 F 3
F 5 F 6
F 8 F 9
F11 F12