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1210 External Connectors, 6890A and6890 PlusOverviewThis section show the pinouts for the external connectors on the back of theAgilent 6890A and 6890 Plus instruments. See section External Connectors,6890N for the 6890N instrument.These connectors are used for communications with external instruments.Back of 6890 GCNumber Description1Signal 1 – Analog output forintegrators or A/D convertersSignal 2 – Analog output forintegrators or A/D convertersJ13/6Remote start-stop for synchronizingGC, integrators, automaticsamplers, MSD, and other GCsJP1/JP24Modem – RS-232 for modem,computer, or controller devicesJP15Sampler-RS-232 for 7673Automatic Liquid SamplerJP27External event contact closures and24 volt outputs for valve controlJ498BCD input for stream selection valves, J6headspace sampler, or other device109GPIB for ChemStation and/or MSD10Modular Input/Output (MIO) slotfor INET card123245678Figure 1210-1Jun 2001ConnectorIDJ2J56890 GC external connectionsElectricalAgilent 6890 Gas Chromatograph Service Manual1 of 14

1210External Connectors, 6890A and 6890 PlusOverviewThe table details the additional external connectors used on the 6890 Plus GC.NoteThe external RS-232 connector for the sampler is not used on this model.Back of 6890 Plus GC with G2612A ALSInterface PCB InstalledNumber5111112121313DescriptionNot used for 6890 Plus GC’sSampler–G2613A Automatic LiquidSampler, front injector*Sampler–G2613A Automatic LiquidSampler, back injector*Sampler–G2614ATrayConnectorIDJP2P2P4P3* Default configuration5Figure 1210-22 of 146890 Plus GC external connectionsElectricalAgilent 6890 Gas Chromatograph Service ManualJun 2001

External Connectors, 6890A and 6890 PlusSignal 1/Signal 2 analog out1210Signal 1/Signal 2 analog out356124356Jun 200112J1, J2Analog outPinFunction11 mV COM21 V & 10 V COM31 mV41V5Chassis GND610V4ElectricalAgilent 6890 Gas Chromatograph Service Manual3 of 14

1210External Connectors, 6890A and 6890 PlusAPG remote start/stopAPG remote start/stop1515U52TransceiverJP1, JP2APG BusPin Function1Digital ground2Prepare3Start4Shutdown5Reserved6Power on7Ready8Stop9Start request6969LogicLOW trueLOW trueLOW true (input)LOW trueHIGH trueHIGH true (output)LOW trueLOW true (input) 5Vª 1.7WPrepareStartShutdownReservedReadyStopStart request 5VRelay4 of 14Power onElectricalAgilent 6890 Gas Chromatograph Service ManualJun 2001

External Connectors, 6890A and 6890 PlusAPG remote start/stop1210Signal descriptionsPrepare (low)—Request to prepare for analysis. Receiver is any moduleperforming pre-analysis activities.Start (low)—Request to start run/timetable. Receiver is any moduleperforming runtime-controlled activities.Shutdown (low)—System has serious problem. Receiver is any modulecapable to reduce safety risk.Power On (high)—All modules connected to system are switched on. Receiveris any module relying on operation of others.Ready (high)—System is ready for next analysis. Receiver is any sequencecontroller.Stop (low)—Request to reach system ready state as soon as possible (forexample, stop run, abort or finish, and stop injection). Receiver is any moduleperforming runtime-controlled activities.Start Request (low)—Request to start injection cycle (for example, by a Startkey on any module). Receiver is the automatic liquid sampler.APG remote controlRemote control allows easy connection between single instruments orsystems to ensure coordinated analysis with simple coupling requirements.To provide maximum safety within a distributed analysis system, one line isdedicated to SHUTDOWN the system’s critical parts in case any moduledetects a serious problem.To detect whether all participating modules are switched on or properlypowered, one line is defined to summarize the POWER ON state of allconnected modules.Jun 2001ElectricalAgilent 6890 Gas Chromatograph Service Manual5 of 14

PrepareSystem ReadyWaiting for ReadyPostrunRuntime elapsed / StartRunInjection / StartInj cycle startedStart RequestedSystem ReadyNot Ready during PrepRequest for PrepareSystem ReadyExternal Connectors, 6890A and 6890 PlusAPG remote start/stopWaiting for Ready1210HHStart RequestStartHStopHLReadyShutdown HFigure 1210-3Remote control analysis.Control of analysis is maintained by signal readiness READY for next analysis,followed by START of run and optional STOP of run triggered on the respectivelines. In addition, PREPARE and START REQUEST may be issued.The signal levels are defined as standard TTL levels (0 V is logic true, 5 V islogic false).Input Load 2.2 kOhm against 5 VOutput type is open collector.6 of 14ElectricalAgilent 6890 Gas Chromatograph Service ManualJun 2001

External Connectors, 6890A and 6890 PlusRS-2321210RS-23251965196JP1 (Host/Modem), JP2 (Sampler)RS-232Pin FunctionIn/Out1 DCDINPUT2 RxDINPUT3 TxDOUTPUT4 DTROUTPUT5 GND6 DSRINPUT7 RTSOUTPUT8 CTSINPUT9 unusedINPUT(No Connect)RS-232 Standard wiringTransmitters3 TxD7 RTS4 DTR2 RxDReceiversJun 20018 CTS6 DSR1 DCD5 GNDRS-232 Loop back wiring123456789ElectricalAgilent 6890 Gas Chromatograph Service Manual7 of 14

1210External Connectors, 6890A and 6890 PlusRS-232Signal descriptionsData Carrier Detect—is connected to a general purpose input on theSC26C92. Currently, there are no plans to use this signal.Receive DataTransmit DataData Terminal Ready—will be set ON when the 6890 GC is ready forcommunications (self-test complete).Digital Ground—is tied to the digital signal ground on the mainboard.Data Set Ready—is connected to the SC26C92. Not currently used.Request to Send—is set ON when the 6890 GC to the host when HARDWAREflow control set. If flow control is configured for XON/XOFF or NONE, RTSwill stay ON. If HARDWARE handshake is configured, RTS is used to informthe host that the 6890 GC is ready to communicate and there is room in thedata buffer for data. RTS will follow the same logic as XON/XOFF for pacingdata.Clear to Send—is used for pacing data from the 6890 GC to the host whenHARDWARE flow control is set. When CTS is sensed in the OFF state,transmission will be suspended. If flow control is set to XON/XOFF or NONE,DSR will be ignored.Clear to Send—Not currently used.8 of 14ElectricalAgilent 6890 Gas Chromatograph Service ManualJun 2001

External Connectors, 6890A and 6890 PlusExternal event1210External eventJ4External eventPin Function1 24 V Out 12 24 V Out 23 GND4 GND5 Contact 16 Contact 17 Contact 28 Contact 29 ChassisGND36781259 (Chassis)Max. rating75 mA output75 mA outputValve5648V ac/dc, 250 mA 7748V ac/dc, 250 mA 88Note: The 24V OUT1 and 24V OUT2 signals are shown on the samecircuitry diagram below, however they each have their own distinct circuits. The CONTACT1 and CONTACT2 signals are presented in thesame manner. Bold designators refer to the bold signal to the right. 24VCurrent limited037R88R870350360381 V24 OUT12 V24 OUT2R207R201 287R208R2083 GND4 GND11U113 10Jun 2001U5.5K2RelayU5.6K35 CONTACT IN17 CONTACT IN26 CONTACT OUT18 CONTACT OUT2ElectricalAgilent 6890 Gas Chromatograph Service Manual9 of 14

1210External Connectors, 6890A and 6890 PlusBCD inputsBCD inputsJ6BCD Inputs (TTL)Pin FunctionValue1LS Digit 02LS Digit 13LS Digit 24LS Digit 35 unused6 unused7 unused8GND9 unused10 unused11 unused12 MS Digit 013 MS Digit 114 MS Digit 215 MS Digit 319815LogicLOW trueLOW trueLOW trueLOW trueValue1248LOW trueLOW trueLOW trueLOW true10204080 5Vª 4.7K WLSOLS1LS2LS3MS0MS1MS2MS3U114Buffer10 of 14ElectricalAgilent 6890 Gas Chromatograph Service ManualJun 2001

External Connectors, 6890A and 6890 PlusGPIB1210GPIB2412Female GPIB connector13Jun 20011ElectricalAgilent 6890 Gas Chromatograph Service Manual11 of 14

1210External Connectors, 6890A and 6890 PlusModular Input/Output (MIO) INETModular Input/Output (MIO) INETET Input connectorPin Function In/Out1IN1INPUT2IN2INPUTIN1IN2OUT1(no pin)OUT212 of 14ElectricalAgilent 6890 Gas Chromatograph Service ManualINET Output connectorPin Function In/Out1OUT1OUTPUT2OUT2OUTPUTJun 2001

External Connectors, 6890A and 6890 PlusModular Input/Output (MIO) LAN1210Modular Input/Output (MIO) LAN10 Base-2(BNC/thin coaxial)10 Base-T(RJ45/unshieldedtwisted pair cable)Jun 2001ElectricalAgilent 6890 Gas Chromatograph Service Manual13 of 14

1210External Connectors, 6890A and 6890 PlusSampler injector or traySampler injector or trayInjector or trayPinFunctionA1A814 of calAgilent 6890 Gas Chromatograph Service ManualJun 2001