- Preferred processor chip: Maxim or NI
This is the most important step. The reason why we highly recommend a RS232 to RS485 converter with a Maxim or National Instruments (NI) processor chip is because these are simply the best. We have extensive experience with these processors and time has shown us that these processor chips works with the majority of devices and equipment on the market. Very stable and east to use.
- Preferred supporting serial driver chip: Phillips, Maxim or NI
A RS232 to RS485 converter consists of several IC's, the main IC is the converter chip, another very important chip is called a Schmitt trigger, it controls the RS485 output signal. To ensure a good stable signal we recommend a RS232 to RS485 converter with a quality brand name Schmitt trigger from either Phillips, Maxim or NI.
- Minimum +/- 1.5V output voltage at RS485 side
We recommend a RS232 to RS485 converter with at least 1.5V power output for the RS485 TX/RX signals. This will ensure a strong communication signal and that your RS485 device gets sufficient power.
- Build-in static protection to at least 600W
Built-in static protection protects the RS232 to RS485 converter against high voltage spikes created either by static electricity or by surges in the supply voltage. This problem can exist both at the RS232 end and the RS485 end.
- LED lights for TX and RX activity
Not required but very nice to have. Being able to actually see when data is transmitted through the adapter is a big advantage when troubleshooting. This way its easier to find out where the problem lies; if its your computer, your device connected to the converter or the converter itself.
Things to avoid:
- Avoid converters with low-cost processors. These processors are usually poorly made Chinese products, incompatible with the serial standard, providing less than average signal charasteristics and noisy signal levels, resulting in broken or incompatible communication.
- Avoid converters with a low output power (less than 1.5V). Low output power makes the communication unreliable or even impossible.
Here is an overview of all our RS232 to RS485 converters.
For further information regarding serial data communication, questions or suggestions please contact us.
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