Serialio.com USB RS-232 Application Notes
I can receive data, but can't transfer data
I bought your converter to get a serial port on my macbook pro os x 10.4.11. I installed the driver and downloaded Zterm.
The driver finds the converter; network is set not to associate to the usb-serial port.
I can receive on the serial port, but cannot transmit anything....
Is there some known fix to this issue?
Most commonly this would be caused by a flow control issue. The other side of the connection may have flow control disabled.
You might also find something more bizarre as this customer did…
I am attaching to an embedded device, all I have is Rx/Tx and GND. No flow control.
The problem ended up being GND was wired up on the cable to RTS instead of pin 5 (RS232 DB-9 pin number) GND. Somehow with the prolific 2303 chip this causes no TX happen, just get RX data from the device, whereas with a different USB serial adapter, it works okay.