Functions Overview - Alpermann+Velte AV-MTD G 30 TTT Operating Manual

Functions Overview

Alpermann+Velte has developed a system for Multiple Time Displays (MTD). A MTD system
consists of a central generator unit, digital displays and/or analogue clocks, and user
console(s). The central generator unit outputs a special LTC format. This LTC will henceforth
denoted as LTC(MTD). The LTC(MTD) represents the data link to all the digital displays, and it
contains real-time, date and user selectable timers.
G 30 TTT is a central generator unit of the MTD system. The generated LTC is externally
locked to video (CVBS or black burst). Alternatively if there is no external sync source, LTC is
internally synchronised via a crystal. Integrated components are an LTC reader, a RS485 serial
interface and the balanced LTC output.
The time information of the generated LTC may be selected as:
• real-time,
• identical to the LTC of the built-in reader,
identical to the time E (in the MTD timer system),
•
• continuing from a start value.
The selection is made by pressing a button on the front of the unit.
The user bits of the generated LTC(MTD) contain real-time and date, six independent times
A...F (e.g. stop watches or the time of the readout LTC), and status data. These data are
destined for a MTD timer system. With this system, all times may be displayed and operated.
Operational units (MTD-BE or MTD-BTK) communicate with the G30TT via the RS485 serial
interface.
For operation in a non "MTD system" the way to process the user bits can be changed. For
example generating a "Real-time" LTC the time equals to the local time and the user bits carry
the date (different formats selectable).
All settings of the G 30 TTT as well as of the MTD system – (i.e. settings that have been made
via a MTD user console)- will be stored permanently, even when the G 30 TTT is switched off.
The standard options for the G 30 TTT are as follows:
• DCF77 or GPS reception by built-in receiver,
• DCF77 or GPS reception by external receiver,
colour framing according to 4-field or 8-field (8-field uses the white flag in line 7 of a
•
black burst),
• GPI = settable trigger of a built-in relay by time A or B of the MTD system.
Further options may be built in if required. Example of special options:
• Receiving a "real-time" from an LTC, i.e. a second built-in LTC receiver simulating a
DCF77 or GPS reception.
• Having a DCF77 and GPS receiver built-in. One of both can be activated by menu
selection.
• Converting Central European Time (CET/CEST) to UTC.
• Receiving CET/CEST by writing UTC into time E.
VITC generator.
•
Operating Manual AV-MTD G 30 TTT
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