Westermo U200 Operator manal - Manual (Page 42)

V4.5
www.westermo.com
U/R/T200 series
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12.7 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 client or IEEE1588 Slave
operation. PPX means that a Pulse Per X seconds is generated. The interval X is 1 by
default.
The PPX signal, pulse duration and interval, X, for one or both of the two output signals on
the 15 pin connector can be configured via SNMP.
Legal intervals are:
X = [1, 5, 10, 60, 3600] seconds.
The interval can be different for the two PPX signals.
Legal durations are:
[10us, 20us, 30us, 40us, 50us, 60us, 70us, 80us, 90us, 100us, 1ms, 10ms, 100ms]
The pulse duration is the same for the two PPX signals.
Each of the two output signals is available either as a TTL signal or RS422.
12.8 X KHz output signal on GPS interface
Two xKHz 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 client or IEEE1588 Slave
operation. xKHz means a output signal of x KHz.
The xKHz signal and its frequency, x, for one or both of the two output signals on the 15 pin
connector can be configured via SNMP.
Legal frequency range is:
X = [1000 .. 50.000] Hz
Each of the two output signals is available either as a TTL signal or RS422.
12.9 External GPS
The T200 GPS interface supports the use of RS422 interface between the T200 switch and
the GPS receiver. The interface that is not used shall be left unconnected. RS422 is preferred
in all industrial installations due to improved immunity and possibility to use long cables (up to
1km). Several T200’s can use the same GPS if RS422 is based on multi drop. Up to four
T200 connected to the same RS422 bus has been verified. Shielded cables that comply with
RS422 installations and relevant environment shall be used. The GPS interface connector is
described in details in the Installation Guide.
An isolation barrier with 3kV (peak to peak) isolation is present between interface signals and
internal electronics. Surge clamping devices is present on each input protecting the internal
electronics for high energy surges.
The ACUTIME Gold GPS receiver from Trimble Inc,
www.trimble.com , is the Westermo
OnTime recommended GPS receiver. The GPS receiver and GPS antenna are integrated in
the same IP67 housing, and the GPS interface supports RS422 on both the PPS and the