How to check receive buffer?
Set Pr.589=10, then Pr.590~Pr.599 show the receiving bytes from RS485 serial port.

Pr.590=RX[0]

Pr.591=RX[1]

Pr.592=RX[2]

Pr.593=RX[3]

Pr.594=RX[4]

Pr.595=RX[5]

Pr.596=RX[6]

Pr.597=RX[7]

Pr.598=RX[8]

Pr.599=RX[9], only 10 bytes can be verified

 

How to check transmit buffer?

Set Pr.589=11, then Pr.590~Pr.599 show the data bytes transmit to RS485 serial port.

Pr.590=TX[0]

Pr.591=TX[1]

Pr.592=TX[2]

Pr.593=TX[3]

Pr.594=TX[4]

Pr.595=TX[5]

Pr.596=TX[6]

Pr.597=TX[7]

Pr.598=TX[8]

Pr.599=TX[9], only 10 bytes can be verified  

 

How to check queue status when writing parameters into the PDS drive?

Any parameter write to the PDS drive is temporary stored into a queue buffer( size=30).

Pr.124 shows the status of the queue content.

If Pr.124=0, means the queue is empty.

If Pr.124=n, means the queue has n parameters waiting transfer to EEPROM(EAROM)

Before sending Parameter Write Command, must always check Pr.124 and guarantee its value is less than 25 .