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Run down clock Reset will preset the clock to the alarm point. When zero is reached, if the alarm is enabled, the clock will stop and the whole display will flash and the alarm output will be activated, until the clock is reset. If the alarm is disabled, the clock will run down to zero and then underflow to 99 : 59. Page : 9 9.2.2.- CONNECTION EXAMPLES Different interlinking of the three control lines will produce different operating modes: Stop Start Reset GND Stop Start Reset GND Stop Start Reset GND A A Stop Push B = start A Push A = stop Start B Push C = reset C Reset note A may close while B is shut GND B may open while A is shut A B B Push A = stop Push B = reset Close contact A = reset and run Open contact A = stop With contact B opened close contact A = run open contact A = stop push contact B = reset Push A = start Stop Start Reset GND B Push A = reset and start A Push B = stop (push B again = start) 9.3.- RUN TIME ALARM SETTING The alarm is a 4 decade alarm only. On the 6 decade clock, the alarm setting is for hours and minutes only and on the 4 decade clock the alarm point can be for either hours and minutes or minutes and seconds. Displaying or setting of the alarm point can only be done when the unit is displaying the run time and is not running. The same three contact inputs are used for setting the alarm point and for adjusting the real time clock, but their functions are different. To display the alarm set point, hold the SECONDS input (pin 13) to GND. Once the alarm point is displayed, the value can be changed by contact closure between GND and the following terminals : Seconds ........................... view/adjust alarm point ( hold to GND). Minutes ............................ increment seconds ( or minutes). Hours ............................... increment minutes ( or hours). Hours and Minutes .......... together reset alarm to zero 9.4.- SERIAL DATA OUTPUT The unit incorporates and RS422 level serial ASCII output to allow master/slave clock setups in conjunction with serial ASCII remote displays. Details of the serial output to be found in paragraph 5. Note the line should be terminated to prevent noise pickup if the clock is not transmitting data. 10.- CONFIGURATION 10.1.-POWER SELECTION See the rear label for power requirements. Power supply selection must be done by suitable qualified personnel or by the local distributor. Contact factory or your local distributor for instructions. 10.2.-INSTRUMENT CONFIGURATION To change the instrument configuration, the rear panel of the instrument needs only to be removed to gain access to the internal DIP switches and jumpers located on the control board. Be sure that the instrument is disconnected from any power supply before removing the rear panel. Page : 10 10.2.1-CONTROL BOARD POSITION Control board position for instruments Control board position for instruments series LDP-2X-CX series LDP-4X-CX .................................................................................................................................................................................. 10.2.2-DIP SWITCH AND JUMPERS LOCATION JP5JP9 ................................................................................................................................................ JP10 JP1 JP2 JP3 JP4 ON OFF JP7 JP6 JP8 A B 1 2 3 4 5 6 7 8 9 10 11 12 ON OFF 10.2.3-DIP SWITCH CONFIGURATION Switchnumber 1 2 3 4 5 6 Function Alarm Run time Display brightness Display brightness Clock range Clock range Switch position OFF ONDisable Enable* Up* Down See brightness tableSee brightness tableMM :SS HH :MM12 hours 24 hours* Display brightness table DIPswitch 3 4 brightness % OFF OFF OFF ON ON OFF ON ON 25 50 75 100* 7 Serial data output See serial data output configuration* = Factory set-up 8 Function selection Real time* Run time Page : 11 10.2.4-JUMPERS CONFIGURATION Function Close Jumper 220 . terminator resistor for the RS422 switch debounce of 5 Hz for the STOP line switch debounce of 5 Hz for the START line switch debounce of 5 Hz for the RESET line JP1 (By default opened) JP2* (By default closed) JP3* (By default closed) JP4* (By default closed) Jumper Application A Jumper position B JP5 for STOP line 1 K. pull-up * 1 K. pull-down JP6 for START line falling edge/low level active* rising edge/high level active JP7 for STOP line falling edge/low level active* rising edge/high level active JP8 for RESET line falling edge/low level active* rising edge/high level active JP9 for START line 1 K. pull-up* 1 K. pull-down JP10 for RESET line 1 K. pull-up* 1 K. pull-down * = Factory set-up 10.2.5-SERIAL DATA OUTPUT CONFIGURATION Instrument reference Data output format with DIP switch 7 with DIP switch 7 in position ON in position OFF (NEWPORT mode) Standard modeTransmission during time adjust or in alarm status C2 HHM.MS.S(CR) HH.MM.SS(CR) --(NUL)--(NUL)--(CR) C1 HHM.M(CR) HH.MM(CR) * HH(NUL)MM(CR)** --(NUL)--(CR) C0 MMS.S(CR) MM.SS(CR) --(NUL)--(CR) * = Data output format on...

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