B&B Electronics MESR321_SL_ML - Manual - Manual (Page 62)

Appendices Vlinx MESR321 Modbus Gateway
60
MESR321-xx_R001_2113_m
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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 (4 wire) 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,
14.4k, 19.2k, 28.8k, 38.4k, 57.6k, 115.2k, 230.4k
Data Bits 5, 6, 7, 8
Parity None, even, odd, mark, space
Stop bits 1, 1.5, 2
RS-422/485 biasing Auto 1 K ohm pullups and pulldowns
RS-485 data control Auto control via MCU