Rockwell Automation RECOMM-232 Serial Converter for use with DPI AC Drives - Manual (Page 47)

Glossary Glossary-1
G
LOSSARY
application code - Code that runs in the adapter after the boot
code calls it. It performs the normal operations of the system.
block check character (BCC) - An error detection scheme where
the 2s 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 adapter first receives power. It
checks basic operations and then calls the application code.
bus off - 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.
cyclic redundancy check (CRC) - 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.
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 “serial port rate.”
DPI - A peripheral communication interface used by various
Reliance Electric drives and power products.
DPI peripheral - A device that provides an interface between DPI
and a network or user. Peripheral devices are also referred to as
“adapters” and “modules.” The serial converter and SP600 OIM are
examples of DPI peripherals.
DPI product - A device that uses the DPI communications interface
to communicate with one or more peripheral devices. For example,
a motor drive such as an SP600 AC drive is a DPI product. In this
manual, a DPI product is also referred to as “product” or “host.”
EEPROM - See non-volatile storage.