Yokogawa FieldMate - Manual (Page 366)

<Appendix G Troubleshooting for USB Modem>
App.-45
IM 01R01A01-01E 9th Edition : May 31, 2013-00
Appendix G Troubleshooting for USB
Modem
Please confirm the following points first if the modem does not seem to function properly.
If the problem (s) persists, please contact our service representative in your region.
(Note): Figures in brackets () indicate document number.
Table App.-G-1
# Problem Symptoms and Counter measures
1 USB Modem cannot be
recognized. Check Device
Manager on your PC. If not found,
see solution (s) at right.
- Relating to install procedure
Driver software for USB Modem is not installed properly.
- If in Device Manager “CP210xUSB to UART Bridge Controller,” is
indicated as an unknown device, disconnect the modem from the
USB port and Double-click the following file.
FieldMate CD-ROM\USB_Modem_Drive\Common \
CP210xVCPInstaller.exe.
Ditto
- Relating to your PC environment
An “unknown device” may have hampered the driver software for the
USB Modem.
- Delete the “unknown device” in Device Manager, disconnect the
modem from the USB port and then connect the modem again.
Ditto
- Relating to your PC environment
COM Port is being occupied by other devices.
- Disconnect the other devices using COM port, disconnect the modem
and then connect it again.
Ditto
- Relating to current operation
COM Port is being occupied by another communication application.
- Terminate another communication application first, Disconnect the
modem from the USB port, wait for more than 30 seconds, connect
the modem again.
If the problem persists, restart the PC and check whether the modem
can be recognized.
Ditto
- Relating to current operation
COM Port is being occupied by FieldMate (i.e., in cases where the
modem has been disconnected then reconnected unexpectedly)
- Disconnect the modem from the USB port, wait for more than 30
seconds, then connect the modem again. If the problem persists,
restart the PC and check whether the modem can be recognized.
2 Communication with field device
cannot be established.
PC does not recognize the modem, or driver software cannot be
installed properly.
→ Refer to Problem #1.
Ditto USB Modem is not connected to the PC.
→ Confirm that the modem is connected to the USB port of the PC.
Ditto USB Modem is not connected to the 4-20mA line with communication.
→ Confirm that the current setup follows the description in Part C-3 of
this document.
Ditto Field device is not connected.
→ Confirm that the current setup follows the description in Part C-3 of
this document.
Ditto Power line for the field device is OFF.
→ Confirm that the current setup follows the description and power-on
procedure in Part C-3 of this document.
Also confirm that the required power is supplied to the four wired
device.
- On a field device with an external indicator, check that power is
supplied.
- On a field device with no external indicator, check the voltage on both
sides of the load register according to Part C-3 of this document.
Ditto Load resistor’s resistance is too low.
- More than 250 OHM is required for stable communication. Check the
load resistor currently being used, change or replace it accordingly.
3 When connecting the USB
Modem, the PC hangs up or
reboots.
Modem consumes current in excess of that which the USB can
accommodate.
- Using a USB hub, disconnect the other USB devices. If the problem
persists, contact our service representative in your region.