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CHAPTER 3
Performing Advanced Functions
Serial communication protocol
General format of a command
General format of an answer
4.
Select OK to open the terminal window.
5.
Press Enter to generate a response in the window.
This protocol is based on a master sending commands and a node
answering. The whole communication is conducted in plain ASCII
strings. When exchanging numbers, they are represented in deci-
mal format. All commands are terminated with a CR/LF combina-
tion. All responses (answers) are terminated with the # character.
The commands have the following format:
ID Command Param1 Param2 ... ParamN
•
ID is the destination device. If you include an ID as part of a
command, the node checks whether ID=ownID. If it does, the
node executes the command on itself. If the ID is not the
node's ID, the node executes the command on a remote
device, if such an ID exists. Not naming any ID implies that the
command is addressed locally.
Note: Not all the commands can be executed remotely!
•
Command is the command proper, which can be composed of
a variable string of characters (for example, SLOT). Each node
can implement a set of commands depending on the
functionality of the node itself. However, as a minimum
requirement, a node recognizes the CMDS command, which
returns a list with the commands accepted by the node.
•
Param1 Param2 ... ParamN represent the parameters,
which are command dependent. If you type no parameters
when you issue a command, it is the equivalent of querying
for information (the GET version of a command). If you type
parameters, you are issuing the SET version of a command
and are setting the command to the parameters you typed.
The answers have the following format:
ID Command Result1 Result2 ... ResultN ErrResult #
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