GarettCom 5843HRT User Manual
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Contents
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Models 5843, 5844, 5843S and 5844SRS-232 or TTL4-14. TESTING AND TROUBLESHOOTING4.1 TESTINGModels 5843HRT and 5844HRT lend themselves to easy installation and testing. Testing the unitsrequires transmitting and receiving data or setting the Test Mode switch to ON while observing thatthe diagnostic LEDs are illuminating in the proper sequence.To test whether a unit is transmitting and receiving correctly, insert a short fiber jumper between itsT and R optical ports, transmit a signal (or turn the Test Mode Switch ON) and note that all fourdiagnostic LEDs should illuminate during communication (refer to Figure 5).To test the units in a loop configuration, two Link/Repeaters are required. Connect short Fiberjumper from the T optical port of one Link/Repeater to the R optical port of the other. Set theRepeat Switch for one of the units to ON and the other to OFF. The unit with the Repeat Switch inthe OFF position is the Master. Using the Master, transmit and receive (or use the Test ModeSwitch in the ON position) through the other unit in the repeat mode. Observe that the diagnosticLEDs illuminate during communication (refer to Figure 5).When a Link/Repeater is not connected to an IED and is in the "repeat" mode, Transmit (pin 2 or pin3) depending on the position of the DCE/DTE switch) and Chassis Ground (pin 1) should beconnected to Signal Common (pin 5). This will prevent any spurious noise from being induced intothe fiber optic loop circuit while servicing an IED.Models 5843SHRT and 5844SHRT (only)When not connected to an IED and in the repeat mode, the Link/Repeater should have ChassisGround (pin 1) connected to Signal Common (pin 5). If these pins are not tied together, noise couldbe induced into the fiber loop. This is also necessary when servicing an IED in order to keep thefiber loop and the Link/Repeater operational.WARNINGThe jumper connecting Chassis Ground and Signal Common should bedisconnected before reconnecting Models 5843SHRT or 5844SHRT toan IED.4.2 TROUBLESHOOTINGIf the unit does not work properly, use the following check list:• Is the unit properly powered?1) Verify the unit is receiving the correct power.2) Is the Power LED on.2) If required, make sure power from D-connector is on Pin 9.• Check that the diagnostic LEDs are responding to the optical and electrical activity.• Is the unit mated properly to the IED? If an adapter is used, check that pin assignments areconnected correctly.1) Are the fiber cables connected properly? T to R; not R to R nor T to T.2) Is the DTE/DCE switch and the Repeat switch set to the proper positions for theapplication? |
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