Commonly Asked Questions - TC Communications TC2200R User Manual

Commonly Asked Questions

1. Where is the best place to begin installation for a bus topology application ?
Ans: Begin with the Master unit. The first priority is to get familiar with the functions of DIP switches
and LEDs.
2. How do I know if the optic link is open or closed ?
Ans: The "SynA" and/or "SynB" LEDs on the affected units will flash if the associated link is not
closed.
3. What direction is the optic signal traveling in ?
Ans: The fiber signal that transmits to the East side of the unit is designated as "A", which means from
one unit's optic "TxA" to the next unit's optic "RxA." The fiber signal that transmits to the West
side of the unit is designated as "B," which means from one unit's optic "TxB" to the next unit's
optic "RxB."
4. What do the front panel's "BRD" & "RSP" LEDs mean ?
Ans: The "BRD-1" & "BRD-2" stand for Broadcast Data. They are the signals from the SCADA Host
(connected to the Master) to be transmitted (or broadcasted) to the Slaves. The "BRD-1" &
"BRD-2" LEDs on the Master unit reflect the incoming signal status of the DB25's connector pins
2 & 4 (for an RS-232 interface) from the SCADA host. On the Slave units, the "BRD-1" & "BRD-
2" are the received broadcast signals originating from the SCADA host.
The "RSP-1" & "RSP-2" stand for Response Data. On the Slave unit, they are the response
signals from the local RTU to be transmitted to the Master. The "RSP-1" & "RSP-2" LEDs on
the Slave unit reflect the outgoing signal status of the DB25's connector pins 3 & 5 (for an RS-
232 interface) from the local RTU. On the Master, the "RSP-1" & "RSP-2" are the received
response signals originating from the RTU.
The following tables explain the definitions of each "BRD" and "RSP" LED for Master & Slave
units for an RS-232 interface:
Figure 20. "BRD" and "RSP" LED Definitions for an RS-232 Interface
- 18 -
TC2200R/S Bus
User's Manual
Rev. 2.2