Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 175)

OPERATOR INTERFACE TERMINAL PV-550 REV E 7-51
1557-UM050F-EN-P – June 2013
To reset the above counters, press the [F8] key.
The BUFFERS show the current contents (in hexadecimal) of the Transmit (TX) and Receive
(RX) buffers contained in the terminal. These buffers are circular in nature. The Psh (push) and
Pop values indicate the location in the buffer where the next character will be loaded or unloaded
respectively. If the values are equal, then the buffer is empty. To aid in viewing the buffer
locations, the cursor keys can be used to highlight the buffer contents. The current location of the
cursor is shown in reverse video in the mid right screen.
Protocol Analyzer
The protocol analyzer is accessed from the COMMUNICATIONS screen by pressing the [F7] key.
The screen shows the data and the relationship of the data exchanged between the terminal and
the drive board. This data can be displayed in either one of two formats:
- the data shown in hexadecimal (Figure 83) ,
- the data shown as a mixture (Figure 84) of: a) control characters
b) printable ASCII characters
c) hexadecimal data.
The format of the displayed data is changed by pressing the [F7] key. When data is shown as a
mixture, a particular value is displayed based on the priority defined above, (control characters is
highest).
The RX row displays data received by the terminal. The TX row displays the data transmitted by
the terminal.
Print Screen
The print screen operation allows a screen dump of the terminal's display. This requires the use
of a second RS232 port communicating at 600 Baud to an external computer. Special software is
required in the computer to receive the data and to interpret the data.
The operation is initiated from any screen by pressing the [F10] key and the [cursor right] key at
the same time. The screen will clear and a message will indicate that the screen is being printed
as well as the percentage completed. When complete, the original screen will return.
Figure 83 – Hexadecimal Displayed Figure 84 – Mixed Format Displayed