Beijer Electronics MT 230 Nautic Monitor EN - Manual (Page 32)

Interfaces and Functions
32 Beijer Electronics, MAEN956
9.5 Serial Interfaces
The RS232 interface serves for the data communication. Data will be trans-
ferred as ASCII code. The RS232 represents a voltage-referred interface, and is
suited only for short cable lengths by approximately 10-15 meters.
The RS485 bus interface operates as RS422 in opposite clock mode; however
only two lines are needed; these are half duplex. It is possible to connect several
transmitters and receivers via RS485 with the help of a protocol (up to 32 par-
ticipants). The ISO standard 8482 plans a maximum cable length of 500 meters.
The distance between two terminals can be increased with capacity and/or ab-
sorption-poor, in pairs stranded (twisted pair) cable: RS485 supports thus cable
lengths of up to 1.2 km.
Function
Connection between the PC and the monitor to configure, control and read sta-
tus, either point-to-point with RS232 connection, or connection up to 16 mon-
itors in RS485 mode. Functions such as status read (firmware, version, display
ID), control (brightness, backlight, potentiometer) as well as configuration (IP
address, subfunctions of the OSD menu) are available.
RS232
RS485
RS232
RS485 1 2 16...