TV210V, U, G, W & TV400 V, U, G, W
Spectracom Corporation
TimeView Digital Display Clocks Instruction Manual
2-20
2.5.7 Wired RS-485 Ports
Two RS-485 output ports are provided on the rear of the clock as shown below. (In the
wireless clocks, BOTH ports are output ports.)
Figure 2-9: Rear Panel Ports
These ports provide serial data time code connectivity to other Spectracom Corporation
products. Both ports are outputs. They can be used to drive other wired clocks that
are unable to receive radio signal. They can also provide remote timing for other
Spectracom products that receive serial time code data, such the wired display clocks
and Spectracom’s TimeTap devices.
The default format output from the wireless clock is Data Format 0. Format 5 is a
factory option for use with the Status or Alerts LEDs option.
2.5.7.1
Connecting to Model 8188/9188 Ethernet NTP Time Servers
The output port from the Wireless TimeView connects to the RS-485 input of a Model
8188/9188 Ethernet NTP Time Server to provide a quick and easy way to locate a
precision NTP Time Server anywhere in the wireless coverage region. The precision
time code received by the clock’s receiver is repeated out the data port with accuracy of
+/- 100 milliseconds to the clock’s internal time.
The RS-485 Time Code output from the Wireless Clock is the same as the output from
any other Spectracom NetClock product, so follow the installation directions from the
Model 8188 or 9188 NTP Time Server and use the wireless clock as the time source
instead of a NetClock.
Once synchronized, the TimeView will output this code every second, using its own
internal oscillator to keep precision time. If the Wireless Clock stops receiving the
TimeBurst after 80 minutes, it will note this in the serial time code output status byte,
indicating that the time code may no longer be within the 100 millisecond accuracy.
