Quatech RS-485 - Manual (Page 7)

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DC-In Power Outlet
The Bluetooth to RS232 / 422 / 485 is powered by a single 9V DC (Inner
positive/outer negative) power supply and 200mA of current. A suitable
power supply adapter is part of the package. Connect the power line to the
power outlet beside of antenna connector and put the adapter into the
socket. If the power is properly supplied, the red color LED (SYS ) will be
on.
DC-In
Power Outlet
Serial I/O Port
RS-232
Sync Button
LED Indicators
Antenna
Serial I/O Port
RS422/485