Rockwell Automation MD60 Serial Converter Module - M/N MDCOMM 232 - Manual (Page 48)

Glossary-2 Serial Converter Module (MDCOMM-232)
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.
serial converter - A device that provides an electronic
communications interface between an MD60 or MD65 drive and a
computer with an RS-232 port. The MDCOMM-232 Serial
Converter uses a full-duplex RS-232 DF1 protocol.
Slave - The Slave command follows protocol by responding to an
order given by the Master.
SP3 (Service Pack 3) - A service pack is an update that corrects
problems. Six service packs are available for Windows NT 4.0, but
an SP3 or later is needed for Flash updates.
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 module
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 a module is using.
VS Utilities software - A Windows-based software tool for
monitoring and configuring Reliance Electric products and modules.
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.