Allen-Bradley SLC 500 Manual page 102

The Function keys were setup to send specific command strings. The setup is shown below.
Pressing the F1 key will send the string "Rec Data 123 ^M." The format must be "Rec Data " because
this was specified for the Data Display sequence. The number following the "Rec Data " string will
become the data stored in RL2. The "^M" is the End of Packet Character specified in the Flex Protocol
setup.
Pressing F2 sends a different value to RL2 using the same command sequence described above.
Pressing F3 or F4 will send out a string "Unsol Rec ", which is the format for the unsolicited sequence
Data Display RL3. When this string is received by the display, the format will be checked and if it is
correct, the sequence for Data Display RL3 will be executed. The sequence consists of reading the
string, which updates RL3 register, and sending out a reply string.
Function keys F5 and F6 send out incorrect strings and should generate error messages on the display.
270 • • • • ASCII Flex Protocol
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