Connect Tech CTIM-00044 user manual Serial Line Interface Tutorial, RS-232 Line Interface

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Connect Tech Blue Heat/Net Sync User Manual

Figure 32: Typical Asynchronous Date Frame

Serial Line Interface Tutorial

RS-232 Line Interface:

RS-232 is the simplest, least expensive line interface standard, the Sipex tranceivers used on the Blue Heat/Net Sync refer to RS232 as V.28 mode. It is also referred to as EIA232 and TIA/EIA-

232.The RS-232 specification signals levels of +3V to +15V for a logic 0 or Space, and -3V to -

15V for a logic 1 or Mark. The Blue Heat/Net Sync has RS-232 signal levels with a typical range of +/- 8 Volts. The maximum cable length you can use with RS-232 is dependant on a number of factors including:

Baud rate: The higher the baud rate, the shorter the cable length must be.

Cable quality: Quality largely refers to the capacitance of the cable. A higher capacitance (usually specified as pF or pico Farads per foot) dictates a lower baud rate, and a shorter maximum length. Low capacitance computer cables for RS-232 applications are available from all wire and cable suppliers.

You can usually operate with cable lengths of up to 100 feet (30 m) at baud rates up to 115.2 Kbps using low capacitance cable. For higher baud rates such as 230.4 Kbps and up, we recommend keeping the cable lengths to within 25 feet (7.6 m).

The TIA/EIA232 specification specifies two connectors: the DB-25 and the DB-9. Each of these connectors has a standardized pinout. Refer to the Pinouts section of the manual for the DB-25 RS-232 (V28) pinout.

Differential Line Interfaces:

The Blue Heat/Net Sync features Sipex SP508 multi-protocol transceivers. These transceivers features the following differential line standards.

V.11: A differential line interface with signal levels compatible with RS-485 and RS-422.

V.10: A single ended line interface that can be wired such that it will have some of the noise cancelling features of RS485 (V.11). This interface is also called RS-423.

V.35: A differential line interface that operates in a current loop. The electrical levels are about +/- 550mV.

RS485/RS422/V.11 Details

V.11, RS-485, or TIA/EIA485, is a differential line interface standard capable of high baud rates over long cables. The Sipex tranceivers used on the Blue Heat/Net Sync refer to RS-485 as V.11

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Contents Blue Heat/Net Sync Limited Lifetime Warranty Telephone/Facsimile Email/InternetMail/Courier Preliminary Testing is still pending Class a Computing DeviceTable of Contents Installing the Blue Heat/Net Sync Configuration Manager List of Figures List of Tables Introduction Blue Heat/Net Sync Installation Overview Understanding Virtual COM PortsConnecting the Blue Heat/Net Sync to Your Network Ethernet LEDsConnecting Serial Devices Serial Port LEDsConnections Blue Heat/Net Synchronous Clocking RS-422/V.11 ConnectionsLoopback Connectors Recommended Pinouts for V.28 RS-232 Loopback ConnectorConnecting Power DC Power ConnectorPhoenix Locking Screw Terminal Connector 5VDC Activating the Special Operations Mode and Default Settings Selecting a Special OperationPower On Diagnostics LED Error CodesCRC Connect Tech Setting a Static or Dynamic IP Address SCM Serial Configuration ManagerSCM Cabling requirements Set the IP Address Using the Web Configuration Manager Set the IP Address Using the Serial Configuration ManagerConfiguration Manager BootloaderSerial Configuration Manager SCM Application  Operating System SoftwareCDS Configuration Data Space Access to CDS ParametersConfiguration Data Space CDS DescriptionSCM Serial Configuration Manager Getting Access to the SCMSCM Command Reference Brief Command ListCommand Details Boot Syntax boot mode= file= delay=Yes Myip= mip= Save File= WCM Web Configuration Manager Signing In to the Web Configuration ManagerBlue Heat/Net Sync Settings Configure Advanced Serial Settings Configure Blue Heat/Net Sync SettingsPage Configure Firmware Restore DefaultsRestore Default Settings Saving To FlashMonitoring Your Blue Heat/Net Monitor Serial Port TrafficMonitor Network Traffic Monitor TCP/IP StatisticsMy Blue Heat/Net Sync My Blue Heat/Net Sync Hardware Details Installing the Blue Heat/Net Sync Configuration Manager Blue Heat/Net Sync Driver/Software Installation CDBlue Heat/Net Sync Software Installation Screen Page Page Running the Configuration Manager Device InstallationConfigure Default Blue Heat/Net Sync Add New Blue Heat/Net SyncAuto Discover Blue Heat/Net Sync Auto Discover Blue Heat/Net Sync ScreenUpgrade using WCM Web Configuration Manager Upgrade using SCM Serial Configuration ManagerHardware Information Hardware ResourcesChip Selects Chip SelectsBase Address Map InterruptsGpio Bits Direction Usage Address Range hexIusc Access Memory Map of Iusc and PLD FunctionsColdFire 5272 Bus A11 A10PLD Resource Access Address Area item Register Offset Accessed HexPLD Memory Map Table FunctionBit Serial Data transfers only IUSC-1 Offset Reg Name Valid Bit Descriptions Reset Values Hex PLD RegistersFSM CTSM1 CTSM0 PLD ID System Block Diagrams Revision Port Settings, Clock Setup and General Settings BHNPortSettingsSerial Mode smode Async MonoSync BiSync Trans-BiSync Iusc Clocking Logic Blue Heat/Net Sync Specifications Protocol Descriptions TelnetMode Equivalent Standard Electrical Typical Voltage PinoutsDB-25 Female Pinouts DB-25 Female PinoutsDB-9 Female Pinouts DB-9 Female PinoutsRack Mount Option Default Settings Network SettingsBoot Settings SCM Operation SettingsCommon Configuration Setups Static IP SetupUsing SCM Using WCMHow the Blue Heat/Net Sync Boots Up Dhcp SetupBootup Sequence Bootup SequenceFlowchart of Special Operations Mode using the reset button Asynchronous Communications TutorialSerial Line Interface Tutorial RS-232 Line InterfaceDifferential Line Interfaces RS485/RS422/V.11 DetailsBasic 4-Wire, Full Duplex Communications Multi-drop 4-Wire, Full Duplex Communications Basic Wire, Half Duplex Multi-drop ConnectionBus Contention on Differential Multi-drop Networks Termination Resistors in Differential Networks Termination Resistors in Differential Networks