Campbell Hausfeld manual Programming the SDM-SIO4, Command Line Operation and Structure

Section 4. Programming the SDM-SIO4

This section gives both the basic commands and advanced command line options which allow testing and advanced configuration of the SDM-SIO4.

4.1 Command Line Operation and Structure

To use the command line mode, connect a computer to port 1 of the SDM-SIO4. The computer should run a terminal emulation program (e.g. GraphTerm) which is set to 9600 baud, 8 data bits and 1 stop bit. If connecting to a PC you will need a null modem cable.

When the computer is connected, the command line can be made active by pressing the small momentary push-button switch, next to the Status LED. When this happens the SDM-SIO4 prompt ( SDMSIO4->) is sent out of port 1. At this prompt a number of commands can be typed and executed.

∙The command line buffer is 512 bytes long so no command with parameters must be longer than this.

∙After ten minutes of inactivity (where no valid commands are executed) the command line mode will time out and port 1 will return to its normal function.

∙The command line mode can be activated while the datalogger is running a program which communicates with the SDM-SIO4. However, all datalogger activity related to port 1 is ignored.

∙Complicated or long string definitions are best set up by editing a text file which includes the string definition commands. This file can then be sent out to the SDM-SIO4 once it is configured in the command line mode. The SDM-SIO4 can accept multiple configuration strings sent within one file.

NOTE By using (datalogger) Instruction P113 Command 321 it is possible to execute a command line command from a datalogger program. See Section 5 of this manual for further details.

4.2 Entering Commands

A command is executed when a carriage return (CR) is sent. This is normally sent by pressing the ENTER key on a computer. The method of entering control characters was discussed in Section 3.1, but is repeated here for convenience.

To enter a control character in the range of 0-255 decimal in a filter string, formatter string or a user string you must use the ‘&hh’ format, where ‘&’ defines the following two characters, ‘hh’, to be a hexadecimal number between 00 and

FF.For example, ‘&de’ would be character 222 decimal. To use ‘&’ within the string you must type ‘&&’ (i.e. && = & when in a string).

NOTE The hex. number must always be two ASCII characters.

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