RFL SMX3/40 Page 14 of 24 Issue 2.02
User Manual
07 May 2009
DIP Switch 6 settings: Switch 6 sets V24 RTS timeout, Timing source and
Aggregate speed
8 7 6 5 4 3 2 1
Aggregate
Speed kbits/s
Timing Source Port 4 Port 3 Port 2 Port 1
00 = 64 00 = X21 Port
10 = 128 01 = Concat Port
01 = 192 10 = Master
11 = 256 11 = Auto
V24 RTS timeout
1 = enable
• V24 Port RTS Timeout:
Normally set to Enabled for a polling system.
When Enabled, the effect of RTS ON is limited to 2 seconds, i.e. CTS and remote
DCD turn OFF and TxD is blocked. In order to recover, RTS presented to the
port has to turn off and remain off for 2 seconds. This feature is to prevent a faulty
RTU of a SCADA system from interfering with traffic on the rest of the SCADA
system.
Do not set to Enabled when port is dedicated for use with MPR or other protection
relay, or when testing with a data tester.
• Timing source: X21 Port, Concatenation Port, Master, Auto,
X21 is the normal setting for applications where the SMX3/40 X21 port is connected
to a service synchronised with the network master clock.
Concatenation Port is the setting used when an X21 link needs to be synchronised to
the network master clock signal from an adjacent link. Signal timing is via the
concatenation port from the co-located unit. When used in conjunction with the
modes Enabled as DCE, (or Enabled as DTE + Signal Timing X), the timing signal
received from the concatenation port will be output onto the X21port.
Master is used where two units are interconnected via concatenation ports and the
X21 service is unavailable. The clock is generated internally and transmitted on X. It
is used with modes Enabled as DCE, (or Enabled as DTE + Signal Timing X); the
timing signal generated internally will be output onto the X21port. This would
generally be used as a test function.
Auto locks timing to the X21 port as a priority and to the Concatenation port if that
fails. When timing is locked to the Concatenation port and an acceptable clock
appears on the X21 port, timing source will revert to the X21 port. This function has a
special application for East-West applications where both X21 and Concatenation
ports receive network master clock timing.
This is not used when concatenating
consecutive point to point links using the concatenation port to connect to an co-
located SMX3/40.
• Aggregate Speed: 64, 126, 192, 256 kbits/s
Set to match the network clock speed. For X21 networks operating at n = 1, set to
64kbits/s.
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Komentarze do niniejszej Instrukcji