3
Date Code 20070803
SEL Application Guide 2000-02
In addition to the detailed monitoring done by the relay, the FGR-115MB also maintains radio
performance statistics that can be accessed by any terminal emulator.
It is important to note that these radios operate in a license free band. This means that radios used
by others could occasionally interfere.
C
OMMISSIONING
T
ESTS
A time delay is incurred when sending a M
IRRORED
B
ITS
message from one SEL relay to another.
To determine the delay attributed to the communications media (propagation delay), in this case
the spread spectrum radios, use the test procedure outlined in
SEL Application Guide 98-11:
Testing the SEL-321-1 Relay-to-Relay Digital Logic Communication Time Delay
. The typical
back to back operate times (exclusive of the radio delays) for M
IRRORED
B
ITS
message at 38400
is 4.2 ms for the SEL-321-1 and SEL-2505 and 8.3 ms for all other SEL M
IRRORED
B
ITS
products.
R
ELAY
S
ETTINGS AND
C
ONNECTIONS
The required port settings for an SEL-351S Relay are shown below. Settings for any relay in the
SEL-351 and SEL-311 family of relays would be the same. To establish communications via the
radio, the most critical settings are PROTO, SPEED, RTSCTS, RXID, and TXID.
=>
SHO P 2 <Enter>
Port 2
PROTO = MB8A
SPEED = 38400 RTSCTS= N RBADPU= 60 CBADPU= 1000
RXID = 1 TXID = 2 RXDFLT=XXXXXXXX
RMB1PU= 1 RMB1DO= 1 RMB2PU= 1 RMB2DO= 1
RMB3PU= 1 RMB3DO= 1 RMB4PU= 1 RMB4DO= 1
RMB5PU= 1 RMB5DO= 1 RMB6PU= 1 RMB6DO= 1
RMB7PU= 1 RMB7DO= 1 RMB8PU= 1 RMB8DO= 1
Set PROTO equal to MB8
x
, where
x
equals A or B depending on which M
IRRORED
B
ITS
channel
is being used. Note, this setting is slightly different in the SEL-2100 or SEL-321 Relay.
Set SPEED equal to 38400.
Set RTSCTS (hardware handshaking) to N to disable that option.
Set the RXID equal to one and TXID equal to two at the Master End. At the remote or Slave
End, set the RXID equal to two and the TXID to one. The relays use these addresses so that the
master relay only receives messages sent by a relay with the matching transmit address and vice
versa.
To connect the relay to the radio, use an SEL-C285 cable, DB-9 male to DB-9 male straight-
through. If complete electrical isolation is desired between the radio and antenna and the relay’s
EIA-232 communications port, use the SEL-2815M Fiber-Optic Transceivers and fiber-optic
cable to connect the relay to the radio as shown in Figure 1.
The required port settings for SEL-400 series relays are shown below. To establish
communications via the radio, the most critical settings are PROTO, MBT, SPEED, STOPBIT,
TXID, RXID, and TXMODE. All other settings are per the application requirements.
=>>
SHO P 3 <Enter>
Port
3
(Continued
on
next
page)
