PNI Legacy Comm Board - Manual (Page 10)

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Command Line Interface
The Command Line interface allows you to use a simple terminal program to communicate with the
CommBoard. The Command Line interface also allows applications written in any language, including
Assembly, Basic, or C to communicate with the CommBoard via the RS-232 or RS-485.
Command Sequence
The sequence of command line events is:
1. Type in the command on the terminal program: cmd?<es>
2. The module processes the command.
3. A reply is sent back to you.
a. If no error $cmdreply*<dcs><es>
b. If error $cmdreply:Exxx*<dcs><es>
Table 11: Command Notation Table
Command
Symbol Response
Symbol
Description
? Indicated query only command or variable
= Indicates assign only command or variable
<aq>
Use ? for query or =<val> for assign
<es> Ending sequence <cr> or <lf> or <cr><lf>
$ Start of checksum data
! RS-485 address follows
: If error occurs; :Ennn
* End of checksum data
<dcs> Checksum
<er> Start of data
n n Usually a lower case ‘n’ will represent a digit (0-9)
n.n n.n Represents a decimal value (positive or negative)
x x Usually a lower case ‘x’ will represent a hex digit (0-F)
xx xx Represents a Uint8
xxxx xxxx Represents a Uint16
xxxxxxxx xxxxxxxx Represents a Uint32
a. XOR checksum method.
CommBoard
Command Line Interface