Westermo U200 Operator manal - Manual (Page 41)

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U/R/T200 series
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A network where time synchronization is both based on time synchronization via the Ethernet
and the serial interface is shown in Figure 18.
Figure 18, SNTP time client and serial time server
12.6 IRIG-B
An optical IRIG-B output signal is generated on the ST 850nm fibre transmitter on the T200
front panel if the switch is enabled for time synchronization. IRIG-B can also be generated on
one or both of the two copper output signal the GPS interface (15 pin connector) on the front
panel of the T200. Each of the two output signals is available either as a TTL signal or
RS422.
The IRIG-B protocol is a serial protocol that is sent every second with the following packet
format:
SS:MM:HH:DD:D0, then status
A position marker, “P” and a “0” is sent between each nibble (e.g. between S and S)
- element 1: SS is seconds, [0..59], note only three bits is used for the second nibble
- element 2: MM is minutes, [0..59]
- element 3: HH is hours, [0..23]
- element 4: DD is days, [0..99]
- element 5: DD is days*100, [0..3]
- element 6: status
- element 7: NA
- element 8: NA
- element 9: NA
- element 10: NA