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:  $49.00  

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

Reference & Support

  • Quick Start
  • Cut Sheet


  • 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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