ICS Advent PCI-ICOM485/4, Product Manual

Page: 16 / 31

Manual Number: 00650-148-1 Page 8
PCI-ICOM485/4 Manual
Baud Rate Ranges
The card has capability for two baud rate ranges and you can select which you wish to use on a
port-by-port basis. One range is for up to 115,200 baud applications and the other is up to 460,800
baud applications.
Note:
Refer to
Baud Rate Divisor Values
on page 16 of the manual.
Auto-RTS Transceiver Control
In RS-485 communications, the driver must be enabled and disabled as needed, allowing all cards
to share a two wire cable. The PCI-ICOM485/4 (/2) card controls the driver automatically. With
automatic control, the driver is enabled when data is ready to be transmitted. The driver remains
enabled for one additional character’s transmission time after data transfer is complete and then is
disabled. The receiver is also normally enabled, then disabled during RS-485 transmissions, and
then re-enabled after transmission is completed (plus one character transmission time). The PCI-
ICOM485/4 (/2) automatically adjusts its timing to the baud rate of the data. (NOTE: Thanks to the
automatic control feature, the card is ideal for use in WIN95 applications.)
PCI-ICOM485/4 (/2) BLOCK DIAGRAM