Rockwell Automation RECOMM-232 Serial Converter for use with DPI AC Drives - Manual (Page 48)

Glossary-2 Serial Converter for use with DPI AC Drives
flash update - The process of updating firmware in a device.
hold last - When communications are disrupted (for example, a
serial cable is disconnected), the converter and product can
respond by holding last state. Hold last state results in the product
receiving the last data received via the DF1 connection before the
disruption. If the product was in RUN mode and using the reference
from the converter, it will continue to run at the same reference.
non-volatile storage (NVS) - NVS is the permanent memory of a
device. Devices such as the converter store parameters and other
information in NVS so that they are not lost when the device loses
power. NVS is sometimes called “EEPROM.”
operator interface module (OIM) - A device that can be used to
configure and control an SP600 AC drive. An OIM can be used to
configure connected peripherals such as the serial converter.
programmable controller communications command (PCCC) -
The protocol used by some controllers to communicate with devices
on a network. Some software products (for example, VS Utilities)
also use PCCC to communicate.
ping - A message that is sent by a DPI product to its peripheral
devices. They use the ping to gather data about the product,
including whether it can receive messages and whether they can
log in for control.
serial converter - A device that provides an electronic
communications interface between a DPI-based drive 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 “converter” or “DPI peripheral.”
status indicators - LEDs that are used to report the status of a
device. There are three status indicators on the converter.
Type 0/Type 1/Type 2 Control - When transmitting I/O, the adapter
can use different types of messages for control. The Type 0, Type 1,
and Type 2 events help Reliance Electric personnel identify the type
of messages that an adapter is using.
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 or a device connected to it.
zero data - When communications are disrupted (e.g., serial cable
is disconnected), the converter and product can respond with zero
data. Zero data results in the product receiving zero as values for
command data. If the product was in RUN mode and using the
reference from the converter, it will stay in run mode but at zero
reference.