V-04.2

The V-404.2 RS232 internal interface module is for synchronisation from and transmission of serial ASCII data at RS232 levels.

V-404.4

The V-404.4 RS422/RS485 internal interface module is for synchronisation from and transmission of serial ASCII data at RS422/RS485 levels.

V-404.E

The V-404.E EBU/SMPTE internal interface module is for synchronisation from EBU/SMPTE time code and up/down display control from a 414 production timer.

V-404.I

The V-404.I IRIG internal interface module is for synchronisation from 1Khz modulated IRIG-B and afnor NFS 87500 time codes.

V-404.M

The local master clock mode enables any V-400A series clock, when fitted with an internal V-404.M interface module, to control up to ten V-400A clocks operating as slaves with a maximum cable length of 200m.

A V-400A clock will only operate as a "local master" clock if, in addition to having a V-404.M module installed, it is maintaining its time-keeping from the internal high stability crystal (stand-alone synchronisation mode) or it is synchronised to MSF or DCF radio time code via a V-484 series receiver.

The slave clocks connected to a "local master" should be connected in parallel to the master clock, by reference to the connection diagrams shown on this page, using a single twisted pair cable.

The interconnecting cable may be unscreened in the majority of installations but should be screened in the presence of high levels (1Vm) of radio frequency emissions or when the interconnecting cable runs are adjacent to machinery or equipment likely to produce significant levels of electrical noise. If screened cable is used the screen should be grounded at the V-400A local master clock end only.

Internal Interface Installation

The V-400A series of clocks and calendar clocks may be programmed to synchronise to and to output a wide variety of signals. In a number of applications, as detailed throughout this manual, an optional internal interface module must be added in order to convert the external signals into the logic levels required by the V-400A series clock or to generate the appropriate output signal levels.

If an external interface is order with a V-400A series clock it will be factory installed prior to despatch. If however it is necessary to subsequently install an interface module in a V-400A series clock the following steps must be taken.

1. Ensure that any power supply to the clock is completely disconnected.
2. Place the clock on a conductive, grounded, work-surface ensuring that the case body is protected to avoid damage to the finish of the case and the front display filter.
3. Unscrew the cross-head self-tapping screws which hold the rear panel to the clock case body. A ‘Pozidrive’ type screwdriver should be used and the screws saved for re-assembly.
4. Locate and remove the battery connection jumper - J4 - which is located above the end of the right-hand battery. To avoid loss retain the jumper on one pin of the J4 header.
5. By reference to the drawing adjacent, locate the ten pin vertical header - J5 - and remove the standard jumper connecting pins 2 and 3.
6. The optional interface module must be installed with the ten way female socket mating with header - J5. The body of the female socket must be towards the square processor chip and on the side of the interface module away from the transformer and batteries. The side of the module carrying surface mounted components must be towards the batteries and transformer.
7. Ensure that the module socket is correctly aligned with the - J5 - header pins.
8. Ensure that the flat, 20 way, interconnecting cable assembly between the display printed circuit board and the power/logic printed circuit board is correctly in place with the cable mounted socket securely seated on the shrouded board mounted plug - J6.
9. Replace the J4 jumper to re-connect the battery.
10. Carefully replace the back cover of the clock ensuring that no strain is placed on the interconnecting cables. All of the original retaining screws must be replaced to ensure electrical and mechanical safety and EMC screening. If any screws have been misplaced they may be replaced with No. 4 x 3/8” self tapping countersunk screws.

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