2.15
Date Code 20060320 Instruction Manual SEL-311C Relay
Installation
Making Rear-Panel Connections
Refer to Table 2.1 for a list of cables available from SEL for various
communication applications. Refer to Section 10: Serial Port
Communications and Commands for detailed cable diagrams for selected
cables (cable diagrams precede Table 10.3).
For example, to connect any EIA-232 port to the 9-pin male connector on a
laptop computer, order cable number C234A and specify the length needed
(standard length is eight feet). To connect the SEL-311C Port 2 to the
SEL-2020 Communications Processor that supplies the communication link
and the IRIG-B time synchronization signal, order cable number C273A. For
connecting devices at distances over 30 feet, SEL offers fiber-optic
transceivers. The SEL-2800 family of transceivers provides fiber-optic links
between devices for electrical isolation and long-distance signal transmission.
Contact SEL for further information on these products.
IRIG-B Time-Code
Input
The SEL-311C accepts a demodulated IRIG-B time signal to synchronize the
relay internal clock with some external source. The IRIG-B time signal does
not update the relay internal year.
A demodulated IRIG-B time code can be input into Serial Port 2 on any of the
SEL-311C models (see Table 10.1) by connecting Serial Port 2 of the
SEL-311C to an SEL-2020 with Cable C273A.
A demodulated IRIG-B time code can also be input into the connector for
Serial Port 1 (see Table 10.2). If demodulated IRIG-B time code is input into
this connector, it should not be input into Serial Port 2 and vice versa.
Table 2.1 Communications Cables to Connect the SEL-311C to Other Devices
SEL-311C
EIA-232 Serial Ports
Connect to Device
(gender refers to the device)
SEL Cable No.
all EIA-232 ports PC, 25-Pin Male (DTE) C227A
all EIA-232 ports Laptop PC, 9-Pin Male (DTE) C234A
all EIA-232 ports SEL-2032, SEL-2030, or
SEL-2020 without IRIG-B
C272A
2 SEL-2032, SEL-2030, or
SEL-2020 with IRIG-B
C273A
all EIA-232 ports SEL-DTA2 C272A
2
a
3
a
a
A corresponding main board jumper must be installed to power the Telenetics Modem with
+5 Vdc (0.5 A limit) from the SEL-311C. See Figure 2.16 and Ta b le 2 . 5.
Telenetics Modem, 5 Vdc Powered C220
a
all EIA-232 ports Standard Modem, 25-Pin Female (DCE) C222
all EIA-232 ports RFL-9660 C245A
all EIA-232 ports SEL-2100 C272A
2 SEL-2100 with IRIG C273A
2
3
SEL-2505 SEL-2800
NOTE: Devices not manufactured by
SEL are listed in Tabl e 2 .1 for the
convenience of our customers. SEL
does not specifically endorse or
recommend such products, nor does
SEL guarantee proper operation of
those products, or the correctness of
connections, over which SEL has no
control.
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