Rockwell Automation 2706-D11JS_D21JS Dataliner DL5 Slave Displays - Manual (Page 39)

Publication 2706-6.4
Chapter
7
Diagnostic Mode
Chapter Objectives This chapter describes the operation of the DL5 Slave in the Diagnostic
Mode. Use the diagnostic mode to verify communications with a host
device. Diagnostic mode displays the exact data being sent by a host
device. Use the diagnostic mode as a temporary installation and
troubleshooting aid.
Set the DL5 Slave for diagnostic mode as described in Chapter 3.
Using the Diagnostic Mode In diagnostic mode, every byte received on the RS-232 port is displayed in a
hexadecimal format on line 1 of the display. The bytes shift from right to
left as each new byte is received. The byte on the right is always the last
byte received. For example:
The value of every byte is displayed including control characters.
Characters are displayed as fast as they are received (no buffer). This
usually means that only the last 5 bytes of a long message are viewable.
Data Errors
If the DL5 Slave and host device are not set to the same serial port settings,
a reception error can occur. Data cannot be displayed if an error occurs.
Instead the DL5 Slave displays an error symbol ‘XX’. The error symbol
indicates serial data was transfered but resulted in an error..
Slave 5, Line 1, Carriage Return
05 01 0D<
05 XX 0D<
Serial Port Error