Acumen SDR2-USB manual Serial Port Basics, Serial specifications, Data rates

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SDR2-USB Configuration Guide rev 1.0

Serial Port Basics

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A.Serial Port

Basics

A.1 Serial specifications

Serial data is any data that is sent one bit at a time using a single electrical signal. In contrast, parallel data is sent 8, 16, 32, or even 64 bits at a time using a signal line for each bit. Data that is sent without the use of a master clock is said to be asynchronous serial data.

Several communications standards exist for the transfer of asynchronous serial data. Common PC’s transfer data using the EIA RS-232C (also known as V.28 or V.24). Updated versions of this standard include RS-232D and EIA/TIA-232E, but most literature still refers to the RS-232C or RS-232 standard.

Other asynchronous serial standards in common use include RS-422, RS- 423, and RS-485. These standards allow higher data rates and longer cable lengths than RS-232 and are common in industrial settings.

A.2 Data rates

The baud rate for a serial connection is the number of bits that are transmitted per second. It is specified in bits/second or baud. For example, a 9600 baud serial link transfers 9600 bits per second.

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Contents Acumen Instruments Corporation Page Copyright Page Table of Contents Service and Support Overview Getting StartedQuick guide to the DataBridge SDR2-USB Before you startConnecting power to your SDR2-USB Configuring your SDR2-USB via the setup fileDeploying the DataBridge SDR2-USB Congratulations Creating setup.txtSDR2-USB Configuring DataBridgeComments Setting date and timeSetting date and time Configuring the data portSpecifying a filename and folder Adding time stamps to recorded files Configuring file creation behaviorTesting your configuration Record mode operation Setup file readingOperations Receiving dataStopping recording Power failure and improper shutdownsDevice removal while recording Filename generationPartitions Formatting the storage mediaResetting to factory defaults Lithium battery maintenanceInitial Setup Commands Setup File ReferenceRecording Behavior Commands Data Port Setup CommandsTime Stamping Commands Scheduled File Closing CommandsOther Commands Location J4 Remote Control PortPinout and Mating Cable FunctionsForce-Record Shunt Installation Page Exception Codes Service SupportService and Support SDR2-USB Configuration Guide rev Returning Equipment Contacting Acumen Instruments CorporationOne year warranty WarrantyExclusions LimitationsSerial specifications Serial Port BasicsData rates Data rates and the Uart More asynchronous serial parametersDTE and DCE Voltage levels HandshakingSDR2-USB Configuration Guide rev Page Specifications Electrical specifications5 J7 rear power receptacle pin configuration 6 J1 power receptacle pin configuration Mechanical SpecificationsSerial communications USB socketSpecifications SDR2-USB Configuration Guide rev