9. Appendices
Vlinx MESR9xx Modbus Gateway
Page 45
Manual Documentation Number MESR9xx-4508m
www.bb-elec.com/
www.bb-europe.com/
Serial Interface Specifications
Mode Selection
RS-232/422/485 software selectable
RS-232 lines
TXD, RXD, RTS, CTS, DTR, DSR, DCD, GND
RS-422 lines
TXDA(-), TXDB(+), RXDA(-), RXDB(+), GND
RS-485 lines (2 wire)
Data(-), Data(+), GND
RS-485 lines (4 wire)
TXDA(-), TXDB(+), RXDA(-), RXDB(+), GND
Baud Rates
75, 150, 300, 600, 1200, 2400, 4800, 7200,
9600, 14400, 19200, 28800, 38400, 57600,
115200, 230400
Data Bits
5, 6, 7, 8
Parity
None, even, odd, mark, space
Stop bits
1, 1.5, 2
Flow control
None, RTS/CTS, XON/XOFF
RS-422/485 biasing
Auto 4.7K ohm pullups and pulldowns
RS-422/485 termination
Auto termination with thru hole resistor (user
supplied)
RS-485 data control
Auto control via MCU
