User manual Version 2.3
ABLELink
®
Ethernet-Serial Server GW21R
Appendix C. Hardware Configuration
C.1 Disable System Firmware
The AP (application program) firmware of GW21R can be disabled. This function is used in the situation
that you downloaded a wrong version of firmware that caused the system crashed.
To disable the current version of firmware and prevent it from executing, please do the followings:
1.Turn off the power, open the case of GW21R.
2.Remove jumper JP1 from the main board to disable AP firmware.
3. Power on GW21R.
4.Download the correct AP firmware to GW21R.
5.Put the jumper JP1 back on to enable AP firmware.
6.Close the case and continue your operations.
Please refer to Figure C.1 Component Side of GW21R main board for jumper JP1 location.
C.2 Choose Type of COM Ports
GW21R
(main board version 1.4)
COM ports can be setup either RS-232 or RS-485 by hardware jumper.
1.Press two holes at lateral side to open the case of GW21R.
2.Set the Jumpers to RS-232 or RS-485.
Short all of the
right
two pins of JP3~8 to set COM1 as RS-485, short all
left
two pins of
JP3~8 to set COM1 as RS-232.
Short all the
right
two pins of JP9~14 to set COM2 as RS-485, short all
left
two pins of
JP9~14 to set COM2 as RS-232.
3.Close the case and continue your operation.
Note:
1.To find the physical locations of these jumpers, please refer to Figure C.1 component side of
Copyright © 2004 Atop Technologies, Inc.
All rights reserved. Designed in Taiwan.
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