Red Lion LEGEND - Manual (Page 47)

5. All command strings must be terminated with an asterisk S (2AH). This
character indicates to the Legend Plus that the command string is complete and
begins processing the command Below are some typical examples of properly
constructed command strings.
(EX. 1) Change Preset 1 Value to 123.4 on the Legend Plus with an
address of 2.
COMMAND STRING: N2VA1234 S
(EX. 2) Transmit the Process Count Value of the Legend Plus unit with
an address of 3.
COMMAND STRING: N3TE S
(EX. 3) Reset Output 1 of the Legend Plus unit with an address of 0.
COMMAND STRING: R1 S
If illegal commands or characters are sent to the Legend Plus, the unit
addressed responds by transmitting an error character “E” (45H) in which case
the string must be re-transmitted.
When writing application programs in Basic, the transmission of spaces or
carriage return and line feed should be inhibited by using the semicolon delimiter
with the “PRINT” statement. The Legend Plus will not accept a carriage return or
line feed as valid characters.
It is recommended that a “Transmit Value” command follow a “Change
Value” Command. If this is done, the reception of the data can provide a timing
reference for sending another command and ensures that the change has
occurred. When a “Change Value or Reset Value” command is sent to the Legend
Plus, time is required for the unit to process the command string. The diagrams
show the timing considerations that need to be made. The Legend Plus process
times shown are for a Legend Plus operating at the maximum count rate. The
process times are count rate dependent and will be considerably less when the
unit is operating at low count rates.
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