GarettCom 5843HRT User Manual
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Contents
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Models 5843, 5844, 5843S and 5844SRS232 or TTL1-61.2.2 DTE/DCE Switch (Two Position Switch)The DTE/DCE Switch on the Link/Repeater switches the functions of pins 2 and 3 to accommodate theIED configuration as DTE or DCE. This is a 2 position switch and both actuators must be set for theLink/Repeater to work properly.DTE: Data Terminal Equipment. By RS-232 standards, equipment designed as DTE transmits dataout of pin 2 on a 9 Pin D-connector and receives data on pin 3.DCE: Data Communication Equipment. By RS-232 standards, equipment designed as DCE transmitsdata out of pin 3 on a 9 Pin D-connector and receives data on pin 2.1.2.3 Data Coupling SwitchThe Data Coupling switch selects the electrical input conditioning, the AC position selectscapacitively coupled, the DC position is directly coupled.AC: AC coupling has a minimum incoming data requirement of 1200 baud due to the capacitivecoupling. This option blocks DC electrical levels should the device connected fail and ‘stickin a high level’. There is a 35 mS timeout for “stuck” output pins, after this time out the linkreturns to LED off state.DC: DC coupling allows DC logic levels to be transmitted over the fiber network, care must betaken to guarantee that when any device stops transmitting packets that the input levelreturns to a state that allows the T receptacle (emitter) to turn off. If it does not and the IEDis part of a loop, bussed or star network, the first device to transmit blocks all other deviceson the network from transmitting. *Single-Mode units cannot be DC coupled.1.2.4 Repeat SwitchThe Repeat Switch enables the repeater function in the “ON” position and disables it in the "OFF"position.ON: The repeater function available in the Link/Repeater is enabled. This function converts theoptical signal received on the R optical port to an electrical signal and delivers this signal tothe appropriate pin of the 9 Pin connector, as well as, re-transmits the signal optically out theLink/Repeater's T optical port.OFF: The repeater function available in the Link/Repeater is disabled. The Link/Repeaterconverts the optical signal received on the R optical port to an electrical signal and deliversthis signal to the appropriate pin of the 9 Pin connector, and does not re-transmit the signaloptically out the Link/Repeater's T optical port.1.2.5 Handshaking Switch 4B:The Handshaking Switch outputs 5 Vdc on a standard handshaking pin in the “ON” position anddisconnects the pins it in the "OFF" position.ON: Pin 6 (Data Set Ready) of the Link/Repeater output 5 Vdc. This signal is used by devicesrequiring handshaking signals to indicate the readiness of the connected devices to receivedata.OFF: Pin 6 of the Link/Repeater is not connected. |
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