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VXI SM8000 Convert hexadecimal value to an integer, Divide by 100 to convert to dB value

Models: SM8000

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			81h

	Command Name	Query Attenuation

	Command Format	81h

	Description	The Query Attenuation command returns the current attenuation value as a 2-byte (16-
		bit) value.

	Example	The following example shows how to translate the HIGH_BYTE-LOW_BYTE
		returned value into a dB attenuation value:
		1.	0Dh & 6Fh = 0D6Fh	HIGH_BYTE and LOW_BYTE value to
				hexadecimal value.
		2.	0D6Fh = 3439	Convert hexadecimal value to an integer
				decimal value.
		3.	3439 / 100 = 34.39	Divide by 100 to convert to dB value.

			82h

	Command Name	Query Minimum Attenuation

	Command Format	82h

	Description	The Query Minimum Attenuation command returns the minimum attenuation setting
		in a 2-byte (16-bit) format.

	Example	The following example shows how to translate the HIGH_BYTE-LOW_BYTE
		returned value into a dB attenuation value:
		1.	0Dh & 6Fh = 0D6Fh	HIGH_BYTE and LOW_BYTE value to
				hexadecimal value.
		2.	0D6Fh = 3439	Convert hexadecimal value to an integer
				decimal value.
		3.	3439 / 100 = 34.39	Divide by 100 to convert to dB value.

SM8000 Series Programming

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Image 65

VXI SM8000 Convert hexadecimal value to an integer, Divide by 100 to convert to dB value, HIGHBYTE and LOWBYTE value to

Contents

P/N Released February 13 VXI Technology, Inc2031 Main Street Irvine, CA 949 OPTICAL SWITCH USER’S MANUALVXI Technology, Inc SECTION TABLE OF CONTENTSSECTION SECTIONUncalibrated Operation - Move-To-Absolute-Step Command SetWrite Example Read ExampleSM8000 Series Preface VXI Technology, IncLIMITATION OF WARRANTY WARRANTYCERTIFICATION RESTRICTED RIGHTS LEGENDD E C L A R A T I O N O F C O N F O R M I T Y Optical SwitchVXI Technology, Inc 2031 Main StreetSM8000 Series Preface VXI Technology, IncTERMS AND SYMBOLS GENERAL SAFETY INSTRUCTIONSUse Proper Power Cord Use Proper Power SourceAvoid Electric Shock WARNINGS CONTGround the Product Operating ConditionsVXI Technology World Headquarters SUPPORT RESOURCESVXI Technology Cleveland Instrument Division VXI Technology Lake Stevens Instrument DivisionSM8000 Series Preface VXI Technology, IncOVERVIEW SECTIONINTRODUCTION SM8000 SERIES - OPTICAL SWITCH CONTROLLER Configurations SM8001 / SM8002 - MULTI-CHANNEL SWITCHES1 x N FIGURE 1-2 SM8001 / 8002 SWITCHESDuplex 1 x N 2 x N Blocking1 All specifications referenced without connectors SM8001 / SM8002 MULTI SWITCH SPECIFICATIONS780 - 1650 nm 0.6 dB typical, 1.2 dB maximumSPST SM8003 - PRISM SWITCHESSPDT Transfer - Position2 Repeatability for 100 cycles at constant temperature SM8003 PRISM SWITCH SPECIFICATIONS780 - 1570 nm 0.6 dB typical, 1.1 dB maximumResolution SM8101 / SM8102 SPECIFICATIONSSM8101 / SM8102 - OPTICAL ATTENUATORS 0 - 10 dBSETTING THE CHASSIS BACKPLANE JUMPERS CALCULATING SYSTEM POWER AND COOLING REQUIREMENTSPREPARATION FOR USE INTRODUCTIONswitch to 1 and the front switch to SETTING THE LOGICAL ADDRESSBACK FRONTDivide by switch to C and the front switch toConvert to MSB and LSB SELECTING THE EXTENDED MEMORY SPACEOPTICAL CONNECTIONS Service should only be performed by qualified personnelCleaning Optical Connectors Mating Optical ConnectorsSECTION OPERATIONGENERAL DESCRIPTION FIGURE 3-2 SM8003 PRISM SWITCHES SM8003 - Prism SwitchesSPST SPDTSM8101 / SM8102 - Optical Attenuators FIGURE 3-3 ATTENUATOR DIAGRAMSM8001 / SM8002 - Multi-Channel Switches OPERATIONResetting the Switch Relay Registers - Output Channel SelectionRESET 1 x N Switch ConfigurationFIGURE 3-4 1 X N SWITCH CONFIGURATION TABLE 3-1 CONTROL CODES FOR 1XN CONFIGURATIONTABLE 3-2 CONTROL CODES FOR DUPLEX 1 X N CONFIGURATION Duplex 1 x N Switch ConfigurationFIGURE 3-5 DUPLEX 1 X N SWITCH CONFIGURATION TABLE 3-3 CONTROL CODES FOR 2 X N BLOCKING CONFIGURATION 2 x N Blocking Switch ConfigurationFIGURE 3-6 2 X N BLOCKING SWITCH CONFIGURATION TABLE 3-4 CONTROL CODES FOR 2 X N NON-BLOCKING CONFIGURATION 2 x N Non-Blocking Switch ConfigurationFIGURE 3-7 2 X N NON-BLOCKING SWITCH CONFIGURATION FIGURE 3-8 MULTI-SWITCH TIMING Calculating Switching TimeSM8101 / SM8102 - Optical Attenuators SM8003 - Prism SwitchesControl Modes Starting the DeviceUncalibrated Operation - Move-To-Absolute-Step Calibrated OperationStep 2 - Query Default Parameters Step 1 - Power Up and InitializeStep 3 - Actuate the Device BUSY SignalPROGRAMMING REGISTER ACCESSADDRESSING thenOFFSET TABLE 4-1 SMIP II REGISTER MAP - A16WRITE FUNCTION READ FUNCTIONID Register - Read Only SMIP II REGISTERS - A16Logical Address Register - Write Only Device Type Register - Read OnlyOffset Register - Read and Write Control Register - Write OnlySerial Number High Register - Read Only Serial Number Low Register - Read OnlyInterrupt Control Register - Read and Write Interrupt Status Register - Read OnlySubclass Register - Read Only ADDRNVM Access Register - Write NVM Access Register - ReadBoard X, Y Used Address Register - Read and Write Trace RAM Start High Register - Read and WriteTrace RAM End Low Register - Read and Write Trace RAM End High Register - Read and WriteTrace RAM Address HIGH Register - Read and Write Trace RAM Address LOW Register - Read and WriteTTL Trigger Polarity Register - Write Only Open Trigger Select Register - Write OnlyADDR ADDRBusy Trigger Control Register - Read and Write Trace RAM Control Register - Read and WriteADDR ADDRBoard Busy Register - Read Only Trigger Advance Register - Write OnlyReserved Registers - Read and Write ADDRVXI Configuration Space FIGURE 4-1 SM8000 SERIES - A24/A32 ADDRESS SPACE1M Memory Allocated to Store Module Settings 1M Memory Allocated for Configuration Relay RegistersControl Register - Read and Write See Typical Optical Multi Switch OperationSee Typical Optical Multi Switch Operation See Typical Optical Multi Switch OperationControl Register cont ADDR Delay Register - Read and WriteControl Register cont ADDR Status Register - Read OnlyADDR Command Register - Write OnlyADDR Address Register - Write OnlyRELAY REGISTER OFFSET DEVICE MEMORYADDR Relay Register 00 - Read and WriteWRITING TO THE RELAY REGISTERS Register 02 thru 08 - Read and Write Relay Optical Module’s Data Attenuation LevelRegister 0A thru 0C - Read Relay Optical Module’s Data Attenuation LevelPROGRAMMING EXAMPLES TYPICAL OPTICAL MULTI-SWITCH CONTROL EXAMPLERead TYPICAL OPTICAL ATTENUATOR CONTROL EXAMPLEWrite To operate the modules correctly, the SM8000 must be loaded with a valid Address in the Address Register. The SM8000 is hard coded at the factory with the optical modules default address of 73 = 49h, and may be used to generate the address used in the command. This is the address of all attenuators as shipped from the factory. During the programming of the optical module, the programmer may wish to omit sending the module’s address over the VXI Bus, letting the SM8000 generate the default address that is used in the command string. This could possibly increase throughput, by decreasing VXI Bus traffic, if the modules are receiving many commands, although this is only true if the optical module’s address is not changed by the user. If the address is to be changed, IT IS IMPERATIVE THAT THE NEW ADDRESS BE WRITTEN DOWN. Failure to do so will result in an inability to control the module. All four possible modules may have the same address. The SM8000 controls them on separate internal busses Bits COMMAND REGISTERTABLE 4-2 ATTENUATOR COMMAND SET COMMAND SETConvert to HIGHBYTE and LOWBYTE format Convert decimal step number to hexadecimalHIGHBYTE and LOWBYTE value to hexadecimal valuePage Convert integer decimal to hexadecimal Multiply dB value by 100 to get integer decimalConvert to HIGHBYTE and LOWBYTE formatdecimal value Convert hexadecimal value to an integerDivide by 100 to convert to dB value HIGHBYTE and LOWBYTE value toHIGHBYTE and LOWBYTE value to decimal value for wavelength nmhexadecimal value Convert hexadecimal value to an integerConvert the HIGHBYTE to get the month Convert to calibration temperatureConvert the MIDBYTE to get the day Convert the LOWBYTE and add 1900 to getnumber Convert the HIGHBYTE into the major revisionConvert the LOWBYTE into the minor revision Put the major and minor numbers together tovalue to an integer Multiply by 100 to convert decimal attenuationCovert integer to hexadecimal Concatenate HIGHBYTE and LOWBYTEused in the command. This is the address of all attenuators as hard coded at the factory with the optical modules defaultthe default address that is used in the command string. This traffic, if the modules are receiving many commands. AlthoughPage SM8000 Series Programming VXI Technology, IncINDEX VXIbus