B&B Electronics 232BRC - Manual - Manual (Page 10)

232BRC-0812 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445
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Baud rates that are not evenly divisible into 1.152 MHz can also
be used, but the actual baud rate will vary slightly from the requested
rate. This may or may not cause data errors, depending on the
attached equipment. Most standard UARTs can accept a 5% to 10%
difference in baud rate before errors occur.
For example:
Desired Baud Rate = 20 kbps
1.152 MHz / 20 kbps = 57.6
Actual Rate = 1.152 MHz / 58 = 19.862 kbps
%error = (20 kbps
– 19.862 kbps) / 20 kbps * 100
%error = 0.7%
Data bits:
Each port can be configured for Five, Six, Seven or Eight data
bits. NOTE: If the ports are set up differently, the port set for fewer
data bits cannot transmit the upper most significant bits.
Parity:
Each port can be configured for Even, Odd, or No parity. The
parity should be selected to match the connected device.
Stop Bits:
Each port can be configured for one or two stop bits. The stop
bits should be selected to match the connected device.
Flow Control:
Hardware(RTS/CTS) Handshaking:
Each port can be independently configured to hold data until
its input handshake line goes high. On Port A, pin seven (RTS)
would have to be held high by the connected device in order for the
232BRC to send data. On Port B, pin eight (CTS) needs to be held
high by the connected device for the 232BRC to send data.
Connected devices can prevent data from being sent from the
232BRC by holding their corresponding handshake lines low. This
corresponds to pin seven on Port A and pin eight on Port B. See
Appendix A for a complete table of signal directions.