Quatech RS-485 - Manual (Page 11)

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Hardware Installation
1. Connect this Bluetooth adapter to COM Port of PC and then to connect DC
power adapter and jack into power outlet and DC-in outlet. You will see the
red LED is going to be on and the green LCD will be blink.
2. After running the BT RS232 Config Tool and finish configuration. Click the
icon of “Connect” in tool software and press the set button of this Bluetooth
adapter immediately.
3. The green LED will be turn into on. The Bluetooth adapter is active.
There are two types of RS232 devices in field. One is DTE - Data Terminal
Equipment (such as a PC) and the other one is DCE - Data Communication
Equipment (such as a Modem). You can setup this adapter device as what type of
the RS232 device you are going to connect in DTE or DCE mode to work with it.
At DCE device side meaning is to connect a DTE of this Bluetooth adapter to the
remote DCE of RS232 device (such as a Modem). On the contrary, DTE device
side to connect a DCE of this Bluetooth adapter to any DTE device, such as a
computer device. For example, you can connect a remote modem with a DTE of
this Bluetooth adapter and meanwhile at PC side, you can either connect a DCE
of this Bluetooth adapter to it.