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How to Solve the Situation of 701ClientSQL Displays Message -- Unknow message from MCU!
2022-08-18
No. S00304006-EN

Serial NO : S00304006-EN

Date of Editing : 2022-08-17

Answer:

This message means that the electronic signal of RS485 has been interrupted, here are three methods to solve the problem:

※Please confirm that whether the wiring of RS485 is being interrupted, simplifying the wiring structure or decrease the wiring distance could improve the interruption.

 

 1- Install AR-485REP-V3 to Extend Wiring Distance  

The theoretical length of RS485 communication line should not exceed 1000 meters. According to actual experience and on-site environment, it is recommended that the 485repeater should be added when the length exceed each 500 meters.

Product Introduction -> AR-485REP-V3 Dual Isolated Half-Duplex RS-485 Repeater

 


 2- Install AR-727-CM to Share Message Receiving 

It is recommended to add an AR-727-CM Converter while the amount of controller is too large to share the signal that need to be polled.

Each Channel of AR-727-CM is recommended to connect 8 pcs Controller (Each AR-727-CM has two channels, total 16 pcs Controller can be connected.)

Product Introduction -> AR-727-CM Serial-to-Ethernet Server&Modbus RTU Over TCP

 


 3- Adopt TCP/IP Controller to Avoid RS485 Interference 

SOYAL E Series Controller supports TCP/IP connection directly, this function could eliminate the probability of signal interruption.  Product Introduction -> E Series Controller Information | SOYAL TECHNOLOGY CO., LTD

 

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