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Models 5843, 5844, 5843S and 5844S
RS232 or TTL
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.
The Point-to-Point concept can be used to create an "optical bus" network. This can be useful for those
situations where the software in the Master has not been written in such a way that it can handle the return
of the transmitted echo that occurs in loop networks.
Figure 7 shows the connection scheme for an RS-232 optical bus.
Note that all Slaves hear the Master's transmission but only the Master hears the response from the
addressed Slave. The Master must always be the first IED in the network.
M aster
T
2
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
RS 232 Master / Slave
R
COM
5
3
2
O N
OFF
O N
O FF
FIGURE 7. RS-232 Bus Configuration
WARNING
NOTE
Typical Slave
T
R
COM
5
3
2
5
3
2-3
Last Slave
T
R
COM
2
5
3
ON
O FF
O N
OFF
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