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Communication Mode
The card supports Half-Duplex communications with a 2-wire cable connection. Half-Duplex allows traffic
to travel in both directions, but only one way at a time. RS485 communications commonly use the Half-
Duplex mode since they share only a single pair of wires.
Baud Rate Ranges
The card has capability for two baud rate ranges and you can select which you wish to use for all ports on
the card. One range is up to 115,200 baud and the other is up to 921,600 baud.
Note
Refer to Table 5-1, Baud Rate Divisor Values in chapter 5 of the manual.
Auto-RTS Transceiver Control
In RS485 communications, the driver must be enabled and disabled as needed, allowing all cards to
share a two wire cable. The card controls the driver automatically. With automatic control, the driver is
enabled when data is ready to be transmitted.
With this card, the driver remains enabled for an adjustable period. It may be disabled at the completion
of the transmission of the character (default), or can be set to wait up to one additional character's
transmission time after data transfer is complete and then disabled.
The receiver is, therefore, normally enabled, then disabled during RS485 transmissions, and then re-
enabled after transmission is completed (adjustable from zero to plus one character transmission time).
The card automatically adjusts it's timing to the baud rate of the data. (NOTE: Thanks to the automatic
control feature, the card is ideal for use in Windows applications)
Manual LPCI-COM-8SM
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