Patent ID: 8607101

Claim:
An RS-485 port test apparatus comprising: an RS-485 connector to receive a first test code signal from a test RS-485 port of an electronic device; a micro control unit (MCU); a multiprotocol transceiver to receive the first test code signal from the RS-485 connector, convert the first test code signal to a second test code signal which can be identified by the MCU, and transmit the second signal to the MCU; and a display connected to the MCU, wherein the MCU receives the second test code signal and displays the second test code signal by the display to compare with the first test code signal; the MCU sends back the second test code signal to the multiprotocol transceiver, the multiprotocol transceiver converts the second test code signal to the first test code and transmits the first test code to the test RS-485 port of the electronic device through the RS-485 connector.