2.19
Date Code 20080213 Instruction Manual SEL-351A Relay
Installation
Making Rear-Panel Connections
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-351A PORT 2 to the
SEL-2032, SEL-2030, or 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 100 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-351A accepts a demodulated IRIG-B time signal to synchronize the
relay internal clock with some external source. The demodulated IRIG-B time
signal can come via the SEL-2032, SEL-2030, or SEL-2020 Communications
Processor listed in Table 2.1, as well as the SEL-2407 and the SEL-2401
Satellite-Synchronized Clocks. The IRIG-B time signal can be input to either
PORT 1 or PORT 2, but not both.
A demodulated IRIG-B time code can be input into serial PORT 2 by
connecting serial PORT 2 of the SEL-351A to an SEL-2032, SEL-2030, or
SEL-2020 Communications Processor using Cable C273A.
Table 2.1 Communications Cables to Connect the SEL-351A to Other
Devices
SEL-351A 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/SEL-2020
without IRIG-B
C272A
2 SEL-2032/SEL-2030/SEL-2020 with IRIG-B C273A
all EIA-232 ports SEL-PRTU C231
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-351A. See Figure 2.26 and Table 2.7.
StarComm
®
Modem, 5 Vdc Powered C220
a
all EIA-232 ports Standard Modem, 25-Pin Female (DCE) C222
all EIA-232 ports RFL 9660 C245A
Courtesy of NationalSwitchgear.com
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