Rockwell Automation 22-SCM-232 Serial Converter Module - Manual (Page 97)

Glossary-3
was running and using the Reference from the converter module, it will
continue to run at the same Reference.
N
Non-Volatile Storage (NVS)
NVS is the permanent memory of a device. Devices such as the serial
converter module and drive store parameters and other information in
NVS so that they are not lost when the device loses power. NVS is
sometimes called “EEPROM.”
P
PCCC (Programmable Controller Communications Command)
PCCC is the protocol used by some controllers to communicate with
devices on a network. Some software products (for example,
DriveExplorer and DriveTools 2000) also use PCCC to communicate.
PowerFlex 4-Class Drives
The Allen-Bradley PowerFlex 4-Class family of drives include the
PowerFlex 4 and PowerFlex 40. These drives can be used for
applications ranging from 0.2 kW (0.25 HP) to 7.5 kW (10 HP). All
PowerFlex 4-Class drives implement DSI, allowing them to use the
22-SCM-232 serial converter module.
S
Serial Converter
The serial converter provides an electronic communications interface
between any Allen-Bradley DSI product and a computer with an RS-232
port. This converter uses a full-duplex RS-232 DF1 protocol. The serial
converter may also be referred to as “22-SCM-232 converter,”
“converter,” “DSI peripheral.”
Status Indicators
Status indicators are LEDs that are used to report the status of the serial
converter module. There are three status indicators on the converter.
X
Xmodem
Developed by Ward Christensen in 1978, Xmodem is a protocol used to
transfer data. You can use the Xmodem protocol to flash the firmware in
the serial converter module or a device connected to it.
Z
Zero Data
When communications are disrupted (for example, a serial cable is
disconnected), the serial converter module and drive can respond with