T&D TR-81 User Manual - Troubleshooting

24

Other

Troubleshooting

Q: 

I can not communicate with my computer using serial (RS-232C) 

communication, what should I do? 

A: 

Please confirm the following items. 

Check the Main Unit

• Check to make sure that there is enough battery power and that the power of the 

main unit is ON. 

• Check the connection between the computer and the Unit.

• Check to make sure that the Unit is connected to the Serial Port (RS-232C) and not 

connected to a different type of communication port (printer or other).  

• If you are using a USB-Serial Adaptor, check to make sure that it is a Operational 

Guaranteed Product 

Check your Computer

• Make sure that the serial port settings are correct and that the port has not been 

rendered unusable by the settings. 

• With some computers, especially all-in-one computers the serial port serves as the 

modem jack.

• Use the Device Manager to check whether the COM port can be used or not.(see 

p.24)

• If you are using a USB-Serial adaptor cable, use the Device Manager to check that 

the driver has been properly installed. If the driver is not installed properly, contact 

the manufacturer of the USB-Serial adaptor cable being used.

• Check to make sure that the serial port has not been rendered unusable by the 

BIOS setting. 

• Sometimes communication will not work if a switch has been added to the serial 

port (RS-232C) or an extension cable has been added to the communication cable. 

• If you have a computer with energy saving function settings, make sure that the 

serial port has not been turned off. 

• If the PC has two serial ports, try connecting the communication cable to the other 

port and try communicating again. 

• Check to see if some other communication software is in use. 

• If you have access to another computer, try seeing if communication works with the 

other computer. 

If none of the above is the cause, there may be a malfunction or product failure. 

Please contact your local dealer.