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R&S®UPP Remote Control - Fundamentals SCPI Command Structure and Syntax Parameter: Parameters must be separated from the header by a "white space". If a command contains several parameters, they are separated by a comma. Example: OUTPut:SAMPle:FREQuency 48000 HZ TRACe:SWE:STORe:AX 1.1,1.2,1.3,1.4 Numeric suffix: If an instrument has several identical functions or features, e.g. inputs, the desired function can be selected by a suffix to the command. Entries without a suffix are interpreted as having a suffix 1. Optional keywords must be specified if they select a function with the suffix. Example: SENSe[1]:FUNCtion RMS SENSe2:FUNCtion IPE SENSe6:FUNCtion LRMS SENSe7:FUNCtion ON These commands activate the measurement functions Function, Input and Level Monitor. The keyword SENSe and the numeric suffixes 2 and 6 must be entered in the command. Note: In case of remote control, suffix counting may differ from the numbers of the corresponding selection used in manual control. SCPI prescribes that suffix counting starts with 1. Suffix 1 is the default state and used when no specific suffix is stated. 6.5.1 Structure of a Program Message A program message can contain one or more commands. It is terminated by a <New Line> (ASCII code 10 decimal) or <EOI> (EOI line active) together with the last useful character of the program message. Seeing as the <Carriage Return> character (ASCII code 13 decimal) has no effect as a filler before the end character, the combination <Carriage Return><New Line> is also admissible. Several commands in a program message are separated by a semicolon ";". If the next command belongs to a different command system, the semicolon is followed by a colon. A colon ':' at the beginning of a command marks the root node of the command tree, but can be omitted. Example: :SENSe:VOLTage:RANGe:MODE FIX;:INPut:MCHannels1 ON This program message contains two commands. The first command belongs to the SENSe system and is used to set a fixed range. The second command belongs to the INPut system and activates channel 1. If the successive commands belong to the same system and therefore have one or more common levels, the program message may be shortened. The second command following the semicolon then starts at the level below the common levels (see also Fig. 5-1 Tree structure of SCPI command systems taking SOURce system as example (extract)). The colon after the semicolon must then be omitted. Example: User Manual 1411.1055.32 ─ 04 623
