GarettCom 5843HRT User Manual page 24

In Peer-to-Peer loop operation, the communication logic (control software) and the Master IED must manage:
1) The transmission to Slaves.
2) The receipt of the echo of its transmissions.
3) The receipt of the Slave's response to its transmission.
4) The control of pin 7 of D-connector.
5) The control of the Slaves to prevent the initiation of a transmission while receiving a signal.
2.3.1 Installation
1. Set the DTE/DCE Switch to the appropriate position for each Link/Repeater and its respective IED.
2. Set the Repeat Switch on all the units to the "OFF" position.
3. Connect the Link/Repeater to the IED's RS-232 or TTL communication port (Including any adapter
that may be needed).
4. Connect the Fiber Optic Cables (T of one device to R of the second device). Continue around the
loop to complete the loop.
5. Connect power to the Link/Repeater as follows:
A) If the unit is to be powered through the D-connector (9 to 15 VDC on pin 9 referenced to pin 5),
then the unit is energized when it is connected to the D-connector (the power LED will
illuminate).
B) If the unit is to be powered through power connector or power connector: Connect the power
leads and the power connector and then energize the power source. The unit is now powered
(the power LED will illuminate).
6. The units are now installed and operating.
7. Verify operation using the diagnostic LEDs. (See Figure 5).
The LEDs only illuminate when there is signal traffic and are not illuminated during signal "quiet" times.
The LEDs may "flicker". This is normal operation.
When installing a Model 5844HRT or 5844SHRT Link/Repeater, an
earth Ground must be attached to the Ground Stud on the side of
the case before connecting to power. Failure to follow this procedure
may result in electrical shock to personnel.
APPLICATION NOTE
WARNING
NOTE
2-10
Models 5843, 5844, 5843S and 5844S
RS232 or TTL