RS-485 pull-high/pull-low and Termination Resistors Module
The SG-785 is an optional module that is used to improve the communication of RS-485 network. It provides switch selectable pull-high and pull-low resistors on RS-485 network. It also has 15-step switch selectable termination resistor such that the user can select a proper termination resistor to be connected to the RS-485 network easily.
Features:
Switch selectable pull-high/pull-low resistors
15-step switch selectable termination resistor
LED Indicator for Power/ Termination
DIN-Rail mountable
Applications:
RS-485 signal pull-high/pull-low and long distance communication termination resistor setting.
Specifications:
Interface: RS-485
Pull-high/pull-low Resistance 1k ohm
Termination Resistance 15 steps, 65 ~ 560 ohm
LED Display 1 red LED as power indicator, 1 green LED as termination indicator Power
Input Range 10 ~ 30 VDC
Power Consumption 0.5 W Environment
Operating Temperature -25 °C ~ +75 °C
Storage Temperature -40 °C ~ +80 °C
Humidity 5 ~ 95% RH, Non-condensing
Switch Setting
SW1
SW2
SW3
SW4
Termination Resistance (ohm)
ON
ON
ON
ON
65
ON
ON
ON
OFF
74
ON
ON
OFF
ON
76
ON
OFF
ON
ON
81
ON
OFF
OFF
ON
99
ON
OFF
ON
OFF
96
ON
ON
OFF
OFF
88
ON
OFF
OFF
OFF
120
OFF
ON
ON
ON
144
OFF
ON
ON
OFF
193
OFF
ON
OFF
ON
207
OFF
ON
OFF
OFF
330
OFF
OFF
ON
ON
256
OFF
OFF
ON
OFF
470
OFF
OFF
OFF
ON
560
SW5
SW6
Termination Resistance (ohm)
ON
OFF
Add a pull high resistor to D+ line
OFF
ON
Add a pull low resistor to D- line
ON
ON
Add a pull high resistor to D+ line and add a pull low resistor to D- line
