features and benefits
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
specifications
LED Indicators| Status | 1 Red LED as Power Indicator | 1 Green LED as Termination Indicator |
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Misc.| Pull-high/Pull-low Resistors | 1 kΩ, 10 kΩ, 100 kΩ, Switch-selectable |
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| Termination Resistance | 15 Steps, 65 ~ 560 Ω |
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Power| Reverse Polarity Protection | Yes |
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| Consumption | 0.5 W Max. |
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Environment| Operating Temperature | -25 °C ~ +75 °C |
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| Storage Temperature | -40 ~ +85 °C |
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| Humidity | 10 ~ 90% RH, Non-condensing |
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