Rockwell Automation 1203-USB USB Converter (Same as DRIVES-UM001) Out of synch with AB version. - Manual (Page 67)

Glossary-1
G
LOSSARY
A Application Code
Code that runs in the converter after the boot code calls it. Application code performs
the normal operations of the converter.
B BCC (Block Check Character)
An error detection scheme using the 2’s complement of the 8-bit sum (modulo-256
arithmetic sum) of all data bytes in a transmission block. It provides a means of
checking the accuracy of each message transmission.
Boot Code
Code that runs when the converter first receives power. Boot code checks basic
operations and then calls the application code.
Bus Off
This term is applicable to only products that implement DPI. A bus off condition occurs
when an abnormal rate of errors is detected on the Control Area Network (CAN) bus in
a device. The bus-off device cannot receive or transmit messages. This condition is
often caused by corruption of the network data signals due to noise or data rate
mismatch.
C ControlFLASH
ControlFLASH is a Reliance Electric software tool that lets users electronically update
firmware on printed circuit boards. The tool takes advantage of the growing use of
flash memory (electronic erasable chips) across industrial control products.
Converter
The 1203-USB converter provides an electronic communications interface between
any Reliance Electric product implementing DPI and MDIand a computer with a USB
port. This converter uses a full-duplex RS-232 DF1 protocol. The converter may also
be referred to as “1203-USB” or “peripheral.”
CRC (Cyclic Redundancy Check)
An error detection scheme where all of the characters in a message are treated as a
string of bits representing a binary number. This number is divided by a predetermined
binary number (a polynomial) and the remainder is appended to the message as a
CRC character. A similar operation occurs at the receiving end to prove transmission
integrity.
D DF1 Protocol
A peer-to-peer link layer protocol that combines features of ANSI X3.28-1976
specification subcategories D1 (data transparency) and F1 (two-way simultaneous
transmission with embedded responses).
DF1 Rate
A unit of signaling speed equal to the number of discrete conditions or signal events
per second. It is also called “baud rate” or “port rate.”