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10.6 Slave clock controlled by supervised RS485
Supervised RS485 line available on the DTS.480x timeservers offers exact time
synchronization as well as monitoring the correct function of connected slave clocks.
• If the DC clock should be monitored set in menu item P8 unique address in the
range 1 to 32. The value "L" means that the clocks are synchronized only (without
monitoring).
• It is necessary to register the clock under the used address in DTS.
• The time synchronization starts within a few tens of seconds after start-up.
• Failure of slave clock function is signalized by an alarm in DTS.
• On the RS485 you can use the jumper TRE - JP10 to connect the termination
resistor 120R between the signals A and B for the correct termination of RS485.
10.7 Cascaded connection of the DCF/GPS synchronized clock
• Connect the DCF 77 receiver to the clock terminal board placed on the anchoring
plate (LINE IN terminals) using a twin-wire cable.
• Set the passive DCF OUT output 3, 4 of the JP1 connector using the jumper JP17.
• When using the GPS receiver, the external power supply is needed - parameters
12-24 VDC – min. 5VA.
• Interconnect the cascaded clock using a twin-wire cable from the DC OUT / DCF
OUT terminals to the LINE IN terminals of the next clock.
• In case the connection is correct and the input signal is at a high level, the LED on
the receiver and the green LED in the clock is flashing periodically once a second,
with 1 pulse left out at the 59th second.
10.8 Synchronization in WTD system
• The items P3, P4 and P7 are set to value A by the production.
• Set the P8 item to the address of the WTD-T transmitter.
• The colon is permanently lit after successful signal receiving from WTD-T
transmitter.
10.9 Connecting the slave displays through RS485
The clock equipped with the SI interface allows connecting up to 32 slave displays,
which show the same information as the main display. The RS485 (JP5) interface is
used for the connection. Two signals (A, B) and the ground connection GND (from the
JP4) are used. For the signals A and B it is recommended to use the twisted pair (pay
attention for the same polarity by all displays), another twisted pair is used for the GND
connection.
If the overall length of the RS485 bus is longer than ca. 500m, enabling the TRE –
JP10 is recommended in the last clock.
• In the clock serving as the master display, set the P13 to value 3 (DC master)
• In the slave displays set the P13 to value 4 (DC slave)
• Items P14 to P17 are set automatically to 9600 baud, 8 bits, even parity, 1 stop-bit.
In case of communication problems it is possible to lower the communication speed.
The modification of the items P14 to P17 is necessary to proceed in all connected
displays identically.
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