V3.8
OnTime Industrial Ethernet
U/R/T200 series Installation Guide
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5.4 IRIG-B
An optical IRIG-B output signal is generated on the ST 850nm fiber transmitter on the T200
front panel if the switch is enabled for SNTP server, SNTP client or IEEE1588 Grand master.
5.5 Pulse Per X seconds on GPS interface
Two PPX copper output signal can be generated on the GPS interface (15 pin connector) on
the front panel of the T200 if the switch is enabled for SNTP server, SNTP client or
IEEE1588 Grand master.
Configuration of these two signals, OUT 1 and OUT 2, is done via SNMP. The following
parameters in the timesync group of the private MIB of Westermo OnTime can be set:
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tsOut1Config [low, IRIG-B, PPX, high]
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tsOut2Config [low, IRIG-B, PPX, high]
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ppxDuration [10us, 20us, 30us, 40us, 50us, 60us, 70us, 80us, 90us, 100us, 1ms, 10ms,
100ms]
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ppxOut1Interval [1, 5, 10, 60, 3600] seconds
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ppxOut2Interval [1, 5, 10, 60, 3600] seconds.
OUT 1 is available on the 15 pin time sync connector (GPS interface) on the T200 front panel.
OUT 1 is pin 9 and 10 (ground) in case of TTL and pin 15(+) and 6(-) in case of RS-422.
OUT 2 is available on the 15 pin time sync connector (GPS interface) on the T200 front panel.
OUT 2 is pin 3 and 7 (ground) in case of TTL and pin 13(+) and 8(-) in case of RS-422.
5.6 Pulse Per Minute
A Pulse Per Minute (PPM) output signal will be generated on the STAT pin on the power
connector if the “Pulse Per Minute” tick box is enabled. This option will disable other fault
contact functions, see chapter 3.3 for details.
6 Serial
Interface
6.1 GPS interface – Acutime 2000
RS-422 signal pairs are used both for communication with the Acutime unit and for the pulse
per second (PPS) signal. The PPS signal is sensitive because the transition of this signal
must be synchronous to absolute time. Therefore use of short range modems, extenders or
other active equipment in-between the Acutime unit and the T208 will most certain reduce the
accuracy dramatically. Westermo OnTime Networks do not recommend using any equipment
what so ever between the Acutime unit and the T208. Passive transient protection may be
used.
In a system that requires redundancy, single point of failure scenarios must be identified.
Therefore using single GPS antenna/receiver may not be sufficient. But in cases where
