Quatech RS-485 - Manual (Page 9)

8
Terminator
The purpose is for compensating signal attenuation in long distance
connection at RS-485/RS-422 I/O. If the switch 1 & 2 are set in “ON”
position, the signal compensation will be activated. To disable the function,
just to push switch 1 & 2 to opposite position.
Set Button
The purpose is for synchronizing between this adapter device and “BT
RS232 Config Tool” software. After finishing the parameter setup of “BT
RS232 Config Tool” software, when you click the icon of “Connect” in “BT
RS232 Config Tool” software and then use any point tip to push this button
immediately on the left side of the device. You will see the icon of “Connect”
turn into “Disconnect” and the meaning is successful to active the device.
Set Button