B&B Electronics 232CC2B User Manual
Documentation Number 232CCxx4502
35
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Chapter 5: Communication Jumper Settings
This chapter will cover all of the jumper settings to set your B&B
Serial Card for the proper communications that you desire.
High Speed Mode
The 232CC Serial has only two communication jumpers
referring to clock speed. High data rates may be obtained with the
232CC cards by placing JP1 or JP2 in the *2 position. This
multiplies the clock speed supplied to the UARTs by 2 times to
3.684MHz for Ports 1 and 2 respectively, allowing data rates up to
230.4 KBaud. Note that serial software is not aware of the change
in oscillator frequency. For example, with JP5 in the *2 position,
setting the baud rate to 115.2 KBaud in software will result in a
actual baud rate of 230.4 KBaud. It is also important to realize that
simply increasing the baud rate may not increase actual throughput.
Often, due to the computer’s inability to respond to interrupts quickly
enough, there will be large idle spaces between characters.
Increasing the baud rate to this point will reduce allowable cable
length, and increase the potential for data errors.
232CC cards by placing JP1 or JP2 in the *2 position. This
multiplies the clock speed supplied to the UARTs by 2 times to
3.684MHz for Ports 1 and 2 respectively, allowing data rates up to
230.4 KBaud. Note that serial software is not aware of the change
in oscillator frequency. For example, with JP5 in the *2 position,
setting the baud rate to 115.2 KBaud in software will result in a
actual baud rate of 230.4 KBaud. It is also important to realize that
simply increasing the baud rate may not increase actual throughput.
Often, due to the computer’s inability to respond to interrupts quickly
enough, there will be large idle spaces between characters.
Increasing the baud rate to this point will reduce allowable cable
length, and increase the potential for data errors.
CAUTION : Electrostatic Sensitive Device.
Use ESD precautions for safe handling.
Use ESD precautions for safe handling.