Loop Operation - Peer-To-Peer Configuration - GarettCom 5843HRT User Manual

5. Connect power to the Link/Repeater as follows:
A)
B)
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.
2.3

LOOP OPERATION - PEER-TO-PEER CONFIGURATION

Before constructing a loop network, be sure that the software protocol is capable of managing the receipt of
the echo of its own transmission. If it cannot, then use Point-to-Point configurations only between devices
in an "optical bus" network approach.
A Peer-to-Peer loop configuration is similar to the Master/Slave loop configuration except that each IED in the
loop is capable of Mastering the loop in a pseudo-Master/Slave loop. To achieve this, Models 5843HRT and
5844HRT provide an electrical means of controlling the "OFF/REP" function.
In this system, all Link/Repeaters are connected in a loop with their Repeat Switch in the "OFF" position. Each
IED must be able to control pin 7 of the D-connector to enable and disable the "ON" function. When an IED
applies a low potential (less than 0.6 Vdc to pin 7) it enables the repeat function of the Link/Repeaters. This is
equivalent to the Repeat Switch being in the "ON" position. When an IED wishes to become the loop Master, it
raises the potential on pin 7 to a high potential (greater than 2.0 Vdc). This disables the Link/Repeaters' repeat
function as if the Repeat Switch were in the "OFF" position.
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).
If the unit is to be powered through the 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).
When installing a Model 5844HRT or 5844SHRT Link/Repeater, an
earth Ground must be attached to the Ground Stud on the face of
the case before connecting to power. Failure to follow this procedure
may result in electrical shock to personnel.
WARNING
NOTE
NOTE
2-8
Models 5843, 5844, 5843S and 5844S
RS232 or TTL