JDS Uniphase RM3750 user manual Programming Guide, RS232 Serial Interface, RS232 Pin Assignment

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RM3 SERIES BACKREFLECTION METER

USER’S MANUAL

Programming Guide

RS232 Serial Interface

The RM meter is equipped with an RS232 serial interface. Through the RS232 connection, the user can download measured values of backreflection, loss, and power to a computer or printer. The RM meter can also use an IEEE 488 parallel interface through the external RS232- to-IEEE 488 converter (described in the RS232-GPIB Converter section).

The RS232 serial interface is configured as data terminal equipment (DTE). The data protocol is set to 2400 baud, ASCII character code with eight bits per character, two stop bits, and no parity bit.

RS232 Pin Assignment

The RS232 pin assignment is shown in Figure 11.

Figure 11: RS232 Pin Assignment

RS232 Interface Specifications

The RS232 interface specifications are listed in Table 8.

Table 8: RS232 Interface Specifications

Name	Symbol	Pin Number	Signal Direction

Transmitted data	TxD	2	→

Received data	RxD	3	←

Request to send	RTS	8	→

Clear to send	CTS	7	←

Data carrier detect	DCD	4	←

Data terminal ready	DTR	6	→

Signal ground	SG	5	↔

To connect the RM meter to the serial port of a computer:

1.Attach a straight-through RS232 cable to the computer and the RS232C port at the back of the meter.

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Contents User’s Manual RM3 Series Backreflection MeterContents Programming Guide Customized Features and Test DataSafety Information Safety Information, Instructions, and SymbolsClass Laser Product Before Initializing and Operating the Unit Safety InstructionsOperating the Unit RM3 Series Backreflection Meter USER’S Manual Symbol Safety SymbolsProceeding CE Compliance ComplianceFDA-CDRH Compliance CSA / IEC Compliance RM3 Series Backreflection Meter USER’S Manual General Information General Information and SpecificationsBackreflection Measurements Loss and Power MeasurementsOutput Port Key FeaturesInternal Light Sources Hybrid JumpersOptional Accessories Standard AccessoriesApplications Parameter Specification Single-mode Multimode SpecificationsFlexcor is a trademark of CorningR Physical ElectricalEnvironmental Before Initializing and Operating the Unit Getting StartedInitial Inspection Storing and Shipping Operating EnvironmentCleaning Connectors Connector Cleaning connector type can vary Powering Up the MeterFront Panel Operating and Maintenance InstructionsKey/LED Description Termination Techniques Rear PanelComponent Function Termination Techniques for Single-mode Fiber except 980 nmMeasuring Backreflection for Single-mode except 980 nm Backreflection Measurements Setting Up the Meter for Backreflection MeasurementsMeasuring Backreflection Setting Up the Meter for Loss and Power Measurements Loss and Power MeasurementsBackreflection Accuracy and Range Loss and Power Measurements Measuring PowerMeasuring Absolute Power Measuring Relative Power Insertion LossMessages and Symbols Data Logging Using the Foot PedalPower Accuracy Display DescriptionStabilizing Calibrating the MeterPower Calibration Adjustment Backreflection Calibration AdjustmentCleaning the Connector Ends Cleaning the UnitMaintaining the Meter Replacement of Internal Fuses Recharging the Battery Troubleshooting Long Cables for single mode model only, except 980 nm model Front Panel ConnectorsLoss Before the DUT Reflections Before the DUTLaser Stability Other Display Problem SolutionCalibration Up the Meter for BackreflectionName Symbol Pin Number Signal Direction RS232 Interface SpecificationsProgramming Guide RS232 Serial InterfaceCommand Action Switch Setting Meaning Left Dip SwitchRight Dip Switch RS232-GPIB ConverterRS232 Interface Program Example Programming ExamplesCustomized Features and Test Data