User manual

User manual Version 2.3

ABLELink

Serial-Ethernet Server

GW21W

Appendix C. Hardware Configuration

C.1 Disable System Firmware

The AP (application program) firmware of GW21W 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 GW21W.

2. Remove jumper JP16 from the main board to disable AP firmware.

3. Power on GW21W.

4. Download the correct AP firmware to GW21W.

5. Put the jumper JP16 back on to enable AP firmware.

6. Close the case and continue your operations.

Please refer to Figure C.1 Component Side of GW21W main board for jumper JP16 location.

C.2 Choose Type of COM Ports

GW21W (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 GW21W.

2. Set the Jumpers to RS-232 or RS-485.

 Short all of the upper two pins of JP4~9 to set COM1 as RS-485, short all lower two pins of

JP4~9 to set COM1 as RS-232.

 Short all the left two pins of JP10~15 to set COM2 as RS-485, short all right two pins of JP10~15

to set COM2 as RS-232.

3. Close the case and continue your operation. To find the physical locations of these jumpers, please

refer to below component side of GW21W main board v1.4.

Note: Monitor.exe utility can be used to demonstrate COM ports properties.

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