Model 735 Intelligent Display User's Manual - Paroscientific, Inc.

5.3 Command and Response BasicsThe Model 735/745 is remotely controlled by serial ASCII commandstrings. The following basic tasks can be accomplished by sending theappropriate command:• Take a measurement• Perform a control function, such as locking the baud rate• Set an operating parameter, such as integration time• Read the value of an operating parameterWhen setting virtually all parameter values, you must precede thecommand with an EW command. This prevents accidental alteration ofstored parameter values. Please refer to paragraphs 5.6 and 5.7.2.1 formore information about the EW command.Measurement commands typically generate a response that contains themeasurement data. Parameter-set commands typically generate aresponse that reports the updated parameter value. Parameter-readcommands report the current parameter value.When a command is received, any command that is in progress will beaborted. This enables you to send an RS-232 command to the Model735/745 at any time, regardless of its current activity.5.4 Command and Response FormatIn general, RS-232 commands and responses are made up of thefollowing:START CHARACTER• The start character is an asterisk (ASCII 42).DESTINATION ID• The destination ID identifies the device that is to receive thecommand or response.• The destination ID is a two-digit integer between 00 and 99. ID00 is reserved for the serial host, usually a PC.SOURCE ID• The source ID identifies the device that is sending the commandor the response.REMOTE OPERATION 5-3