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Frequently Asked Questions
USB QUESTIONS
2) HOW IS A LOOPBACK TEST PERFORMED ON A SerialComm USB TO RS485/RS422 ADAPTER RUNNING IN RS422 MODE?
Answer: To loopback test the USB to RS485/RS422 Adaptor (in RS422 mode), run any HyperTerminal software (such as AccessPort, a free download on the SerialComm website under the downloads menu). Setup the HyperTerminal baud rate, data bits, parity bit, and stop bits. Connect Pin 2 (T+) to Pin 3 (R+) and Pin 1 (T-) to Pin 4 (R-) on the adaptor's connector. Then output ASCII characters from the HyperTermimnal. The output characters should echo-back to the HypterTermainal input. This loopback procedure tests both the transmit and receive functions of the converter.
