Beijer Electronics MT 230 Nautic Monitor EN - Manual (Page 33)

Interfaces and Functions
Beijer Electronics, MAEN956 33
The mode (RS232/RS485) as well as addressing of monitors is made via DIP
switches. See also section
10 DIP Switches .
Serial Connection
RS232 Mode
RS485 Mode
Note:
In RS485 mode the two interfaces can be used as In/Out, with one cable in the first
COM port and one cable in the second COM port.
In RS232 mode only one of the two interfaces can be used (no matter which) - do
not connect a cable to the unused port.
DIP switch 1 Mode
ON RS485
OFF RS232 (default)
Pin Designation Function In/Out
1 + 5 V Out
2 TxD, TX, TD Transmit Data Out
3 RxD, RX, RD Receive Data In
5 GND Ground
9 GND Ground
Pin Designation Function In/Out
1 + 5 V Out
2 Data + Data In/Out
3 Data - Data In/Out
5 GND Ground
9 GND Ground
5 4 3 2 1 5 4 3 2 1
9 8 7 6 9 8 7 6
COM A DSUB (male) COM B DSUB (female)