Description
The tM-SG4 is a 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 so the optimum termination resistor can 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 ends 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 clearly defined square wave. If the square wave signal is distorted, termination resistors will be needed at both ends of the RS-485 network.
Features
- 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
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Technical