Quatech RS-485 - Manual (Page 15)

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The item of parity is set at the “None” item.
Apply “Connect”
After finish the parameters configuration, click the icon of “Connect” in
BT RS232 Config Tool screen and meanwhile press the Synchronous
button immediately on the left side of the device. And then the next screen
of parameters configuration is pop-up. The icon of “Connect” is changed to
“Disconnect” and two icons will be turned into active mode on the bottom of
the BT RS232 Config Tool screen.