RS-485 Pull-high/Pull-low and Termination Resistors Module.  Improves RS-485 signal by reducing noise in RS-485 signal.

tM-SG4

RS-485 Pull-high/Pull-low and Termination Resistors Module. Improves RS-485 signal by reducing noise in RS-485 signal.

  Price:  $59.00  

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Features

Tm-Sg4 Application The tM-SG4 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. If the RS-485 network is not over 100 meters, the termination resistors are not needed. Otherwise, it may be necessary to insert two termination resistors at both end of the RS-485 network. It is not easy to calculate the value of a termination resistor on the RS-485 network. The best way to do this is to use an oscilloscope to check the RS-485 signal directly. If the impedance match of RS-485 network is OK, the oscilloscope will show a very nice square wave. If these square wave signals are distorted, the user will need to insert two termination resistors at both end of the RS-485 network.

  • Switch-selectable Pull-high/Pull-low Resistors
  • 15-step Switch-selectable Termination Resistor
  • LED Indicator for Power/Termination
  • DIN-Rail mountable
  • Cost-effective
  • Wide Operating Temperature Range: -25 °C ~ +75 °C

Tm-sg4 introduction

Specifications

RS-485 Interface
Pull-high/Pull-low Resistance 1 kΩ, 10 kΩ, 100 kΩ, Switch-selectable
Termination Resistance 15 Steps, 65 ~ 560 Ω
LED Indicators
Power 1 Red LED as Power Indicator
Termination Resistor 1 Green LED as Termination Indicator
EMS Protection
ESD (IEC 61000-4-2) ±4 kV Contact for Each Terminal
Power Requirements
Reverse Polarity Protection Yes
Powered from Terminal Block Yes, 10 ~ 30 VDC
Consumption 0.5 W Max.
Mechanical
Dimensions (W x L x H) 52 mm x 87 mm x 27 mm
Installation DIN-Rail Mounting
Environment
Operating Temperature -25 ~ +75 °C
Storage Temperature -40 ~ +85 °C
Humidity 10 ~ 90% RH, Non-condensing

 

Termination Resistance Settings
120R 330R 470R 560R Termination Resistance (Ω)
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 OFF 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
 
Pull-high and Pull-low Settings
1k 10k 100k RS-485 Data Line Status
OFF OFF OFF No pull-high/pull-low on RS-485 data line
ON OFF OFF 1k [ pull-high and pull-low
OFF ON OFF 10k [ pull-high and pull-low
OFF OFF ON 100k [ pull-high and pull-low
 
Termination Resistance On/Off Switch
OFF Termination Resistor do NOT work.
ON Termination Resistor is worked, and TR LED is light.

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