The LBRX-1MT beacon receiver does not provide any local control interface. It is controlled remotely through a serial RS232 interface. At this interface, the receiver provides two different protocol modes:
After power on, the receiver wakes up in terminal / ASCII protocol mode. In this protocol mode, commands may be entered and terminated by a carriage return character. The receiver processes the command and returns the response, terminated by a CR/LF pair. The terminal / ASCII protocol mode is suitable to configure the receiver manually by means of a terminal program like the "Hyper-terminal" coming with the Microsoft Windows operating system. Due to the lack of any checksum protection, the ASCII protocol is not recommended if the receiver is to be controlled by a M&C computer.
For computer controlled applications, the receiver provides a framed protocol. This protocol implements a checksum protection which ensures that only correctly transferred messages are processed. The receiver automatically detects if it gets accessed through the framed protocol and subsequently disables the the terminal / ASCII protocol until it gets switched off. Chapter " 3.2 Framed Protocol " describes this protocol mode in-depth.
Regardless of the protocol mode, the RS232 interface always operates at 19200 baud, no parity, 8 data bits, one stop bit. To connect the receiver to a computer's (9-pin) RS232 port you need an off the shelf straight-through male to female D-SUB9 cable. For installations, a 3-wire cable (pins 2,3 and 5) is sufficient.
A special feature of the sat-nms LBRX-1MT beacon receiver is the RS422 streaming output port, offering the transmission of the measured beacon level at the full measurement rate with a minimum protocol overhead. The data format used by this port is described in chapter " 3.3 RS422 streaming interface "