Solution:

[Description]: How can I know if ADAM-4520 work normal [Solutions]: 1. Check the LED light Green means power on; Green dim means RS-232 send out; and RED means RS485 send back, 2. Check the setting of communication: Check the baud rate and Data format setting Check the Dip Switch of 1 and 2 follow by the data sheet Check the communication by hyper terminal or loop back device