SEL-2241 Data Sheet Schweitzer Engineering Laboratories, Inc.
2
Figure 3 Final Module Alignment
Connections
Communications Ports
NOTE: Never connect two RTACs via USB to one PC.
All web access, settings changes, and ODBC connec-
tions use either the RTAC Ethernet ports or the front
USB type B port. Until you have configured the Ethernet
interfaces on the RTAC, you will need to use the supplied
USB type B cable to access the RTAC web interface. The
ACSELERATOR RTAC installation will place the required
USB driver on your PC so that you can allow Windows
to install the driver automatically when it detects the
USB connection. Plug the USB cable into the RTAC and
into your PC. If you receive a prompt to connect to Win-
dows Update, select No, not at this time and press Next.
Then use the Windows Device Installation Wizard and
follow the automatic install prompts to install the SEL
USB driver.
After completing this step, you can use IP address
172.29.131.1 to access the RTAC web interface through
the USB cable. See Section 7: Security and Account
Management in the
ACSELERATOR RTAC SEL-5033
Instruction Manual for RTAC web password setup.
The SEL-2241 has four nonisolated serial ports. You can
select all RTAC serial ports through software to be either
EIA-232 or EIA-485/EIA-422. You can configure any
serial protocol on the RTAC to use any of these serial
ports. See Table 1 for the pinout of the RTAC serial ports.
Table 1 Nonisolated Female DB-9 Ports
EIA-232 EIA-485/EIA-422
Pin 1: N/C or +5 Vdc (also
DCD input on COM 1 if
+5 Vdc is disabled)
Pin 1: N/C or +5 Vdc (also
DCD input on COM 1 if
+5 Vdc is disabled)
Pin 2: RXD Pin 2: -RXD
Pin 3: TXD Pin 3: -TXD
Pin 4: +IRIG-B (DTR jumper
option for COM 1)
Pin 4: +IRIG-B
Pin 5: GND Pin 5: GND
Pin 6: -IRIG-B (DSR jumper
option for COM 1)
Pin 6: –IRIG-B
Pin 7: RTS Pin 7: +TXD
Pin 8: CTS Pin 8: +RXD
Pin 9: GND Pin 9: GND
Table 2 Port Characteristics
Port Port Interface Cables
USB B USB Type B to USB
Type A
SEL-C664
ETH 1 and ETH 2 10/100BASE-T (RJ45
for Copper)
SEL-C627
COM 1—COM 4 (serial)
EIA-232 (Nonisolated) SEL-C234A,
SEL-273A, and
SEL-C387 are
popular selec-
tions
IRIG-B INput Female BNC SEL-C953
IRIG-B OUTput Female BNC SEL-C953
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