tM-SG4
RS-485 Pull-high/Pull-low and Termination Resistors Module. Improves RS-485 signal by reducing noise in RS-485 signal.
Features
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
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 |
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