User`s manual

Serial Programming Tools
Intellio C218Turbo User's Manual 4-3
Diagnostic (for MOXA boards only)
A convenient diagnostic program provides internal and external testing, such as IRQ,
TxD/RxD, UART, CTS/RTS, DTR/DSR, DTR/DCD testing, etc., for the MOXA
boards and ports to verify correct operation of both the software and hardware.