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
- Wide Operating Temperature Range: -25 °C ~ +75 °C
|Pull-high/Pull-low Resistance||1 kΩ, 10 kΩ, 100 kΩ, Switch-selectable|
|Termination Resistance||15 Steps, 65 ~ 560 Ω|
|Power||1 Red LED as Power Indicator|
|Termination Resistor||1 Green LED as Termination Indicator|
|ESD (IEC 61000-4-2)||±4 kV Contact for Each Terminal|
|Reverse Polarity Protection||Yes|
|Powered from Terminal Block||Yes, 10 ~ 30 VDC|
|Consumption||0.5 W Max.|
|Dimensions (W x L x H)||52 mm x 87 mm x 27 mm|
|Operating Temperature||-25 ~ +75 °C|
|Storage Temperature||-40 ~ +85 °C|
|Humidity||10 ~ 90% RH, Non-condensing|
RS-485 pull-high , p...
8 Channel Isolated A...
Tiny Modbus TCP to R...
16 Channel Source Ty...
8 Channel Thermistor...
Programmable 8 Seria...
Serial to Ethernet D...