R&S WinIQSIM2 Software Manual - Rohde & Schwarz

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R&S ® WinIQSIM2 Automation of R&S WinIQSIM2 Remote Control Basics Bit No. Meaning 6 User Request This bit is set when the instrument is switched over to manual control. 7 Power On (supply voltage on) This bit is set on switching on the instrument. 6.1.5.5 Questionable Status Register (STATus:QUEStionable) This register contains information on questionable instrument states. Such states may occur when the instrument is not operated in compliance with its specifications. To read the register, use the query commands STAT:QUEST:COND? or STAT:QUEST[:EVEN]?. Table 6-5: Meaning of the bits used in the questionable status register Bit No. Meaning 0-15 not used 6.1.5.6 Operation Status Register (STATus:OPERation) This condition part contains information on the actions currently being performed by the instrument, while the event part contains information on the actions performed by the instrument since the last readout of the register. To read the register, use the query commands STAT:OPER:COND? or STAT:OPER[:EVEN]?. Table 6-6: Meaning of the bits used in the operation status register Bit No. Meaning 0 Calibrating The bit is set during the calibration phase. 1-2 not used 3 Sweeping This bit is set during a sweep in automatic or single mode. 4-15 not used 6.1.5.7 Application of the Status Reporting System The purpose of the status reporting system is to monitor the status of one or several devices in a measuring system. To do this and react appropriately, the controller must receive and evaluate the information of all devices. The following standard methods are used: ● ● ● Service request (SRQ) initiated by the instrument Serial poll of all devices in the bus system, initiated by the controller in order to find out who sent a SRQ and why Query of a specific instrument status by means of commands Software Manual 1008.0858.42 ─ 10 160
R&S ® WinIQSIM2 Automation of R&S WinIQSIM2 Remote Control Basics ● Query of the error queue Service Request Under certain circumstances, the instrument can send a service request (SRQ) to the controller. Usually this service request initiates an interrupt at the controller, to which the control program can react appropriately. An SRQ is always initiated if one or several of bits 2, 4 or 5 of the status byte are set and enabled in the SRE. Each of these bits combines the information of the error queue or the output buffer. In order to use the possibilities of the service request effectively, all bits should be set to "1" in the enable registers SRE and ESE. Example: Use command *OPC to generate an SRQ . *ESE 1 - set bit 0 of ESE (Operation Complete) *SRE 32 - set bit 5 of SRE (ESB). After its settings have been completed, the instrument generates an SRQ. The SRQ is the only possibility for the instrument to become active on its own. Each controller program should set the instrument such that a service request is initiated in the case of malfunction. The program should react appropriately to the service request. Serial Poll In a serial poll, just as with command *STB, the status byte of an instrument is queried. However, the query is realized via interface messages and is thus clearly faster. The serial poll method is defined in IEEE 488.1 and used to be the only standard possibility for different instruments to poll the status byte. The method also works for instruments which do not adhere to SCPI or IEEE 488.2. The serial poll is mainly used to obtain a fast overview of the state of several instruments connected to the controller. Query of an instrument status Each part of any status register can be read using queries. There are two types of commands: ● ● The common commands *ESR?, *IDN?, *IST?, *STB? query the higher-level registers. The commands of the STATus system query the SCPI registers (STATus:QUEStionable...) The returned value is always a decimal number that represents the bit pattern of the queried register. This number is evaluated by the controller program. Queries are usually used after an SRQ in order to obtain more detailed information on the cause of the SRQ. Software Manual 1008.0858.42 ─ 10 161
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