Thiết bị ổn định đường truyền RS-485 ICP DAS tM-SG4 CR
Feature
• 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
Introduction
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.
Application
RS-485 signal pull-high/pull-low and long distance communication termination resistor setting.
Specifications
| LED Indicators |
| Status |
1 Red LED as Power Indicator
1 Green LED as Termination Indicator |
| Misc. |
| Pull-high/Pull-low Resistors |
1 kΩ, 10 kΩ, 100 kΩ, Switch-selectable |
| Termination Resistance |
15 Steps, 65 ~ 560 Ω |
| Power |
| Reverse Polarity Protection |
Yes |
| Consumption |
0.5 W Max. |
| Environment |
| Operating Temperature |
-25 °C ~ +75 °C |
| Storage Temperature |
-40 ~ +85 °C |
| Humidity |
10 ~ 90% RH, Non-condensing |
Download
Datasheet
Documents
Ordering Information
| tM-SG4 CR |
RS-485 Pull-high/Pull-low and Termination Resistor Module (RoHS) |
