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4.10 Communication Port Details
The serial port 405 is configured as EIA RS-232 DCE devices with female
DB9 connectors. This allows them to be connected directly to a PC serial port
with a standard straight-through male-to-female serial cable.
A modem adapter (part #101629) is available to convert a port into a DTE de-
vice, equivalent to the serial port on a PC. The adapter allows you connect an
external modem to the recorder’s Port 405 using a standard modem cable.
The TESLA LITE Power System Monitoring Recorder (v1.1 or higher) has
been factory configured to communicate to peripheral software tools and de-
vices using the ERLPhase registered IANA Port 7631. Previous firmware ver-
sions configured for Port 2000 operation will be altered during the TESLA
LITE firmware update process to use Port 7631.
Notes:
IED is DCE, PC is DTE.
Pins 1 and 6 are tied together internal to the IED.
Table 4.3: TESLA Recorder Serial Ports
Port Location Function
405 Rear Panel Serial port for connection to an external modem or for direct con-
nection to a computer (configurable). Default baud rate set at
38,400 baud.
404 Rear Panel Connection to SCADA (DNP3 or Modbus) interface. Default baud
rate set at 19,200 baud.
Table 4.4: Signal connections to pins on Recorder Port
Signal Name Direction PC<->IED Pin # on the IED Port
DCD

1
RxD

2
TxD

3
DTR

4
Common 5
DSR

6
RTS

7
CTS

8
No connection 9