Parker PDHX-E Series User Manual page 70

The example below shows a set of individual command entries with space delimiters on the
same line:
MN A10 V2 D25000 L10 G N
If spaces are used as the delimiter and a large number of multiple command entries are
made, you could exceed the ability of your terminal to display characters as a single line (80
characters per line is a typical value). When the carriage return is used as a delimiter, the
cursor returns to the beginning of the next line.
NOTE: The Positioner will normally echo carriage return with carriage return line feed in
terminal mode. If you get double line spacing you need to turn off the auto line feed facility on
your terminal. In computer mode (EX0) only the characters received are echoed.
The example that follows shows the effect of using carriage return as the delimiter when the
terminal is not in auto line feed.
MN
A10
V2
D25000
L10
G
N
Immediate Commands
Commands that are identified as "Immediate" are executed immediately on receipt and will
take priority over whatever operation is in progress. These commands include various Stop
commands that clear the command buffer, and various Status Request commands that have
no effect on the command buffer.
Buffered Commands
Commands that are identified as "Buffered" are received by the positioner and stored (in the
command buffer) if the positioner is not free to execute them. Stored commands are
executed as soon as the positioner gets to them, in the order that they were received.
Buffer Capacity
Any combination of individual commands and command groups can be entered in the buffer
until the total number of characters currently stored (including the delimiters) equals 2000.
The positioner uses a first-in-first-out serial buffer. As the commands are read from the
buffer, additional commands can be entered to replace them. Therefore, the possibility exists
that a command set could actually consist of more than 2000 characters. Examples of
command sets that might be used for different applications are presented later.
The sequence buffer is different from the command buffer in that it can be copied to battery
backed up RAM using the SV command, while the command buffer is not battery backed up,
so its contents are lost on power down.
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