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| Dip switches both toggle down RS485 Termination Resistor is Off (disabled) |
Dip switches both toggle up RS485 Termination Resistor is On (enabled) |
In general operating environments, the termination resistor should be turned off when RS485 wiring length is less than 500 meters.
If garbled data occurs when RS485 wiring length is up to 500 meters or above, the termination resistor of the last unit can be turned on and see if garbled data no more generated.
The two switches of the termination resistor are one for RX and the othe for TX, they must be either both toggle down or both toggle up, BUT NOT one toggle down and the other toggle up.
Whether the termination resistor should be turned on depending on the actual operating environment. User needs to test in the actual operating environment until finding the correct result.
Garbled data could occur if
1. Termination resistor should be turned off but turned on, or the termination resistor should be turned on but turned off.
2. Two switches of the termination resistor are one switch toggle down and the other toggle up.