User`s manual

User's Manual

6.6. Wordclock (ADX-64B-PRO only)

The ADX itself do not need a clock to operate. The wordclock feature is provided for the distribution of the

wordclock signal only and is independent of the ADX operation.

The wordclock function uses Channel 5 for transmission and can operate in two different modes, selectable by

DIP switch 6:

 Multi: ADAT transmission on channel 5 works as every other ADAT channel. Additionally, a wordclock derived

from the ADAT data stream is output on the WORDCLOCK jack. Note that in this mode, WORDCLOCK is

always an output, regardless of the direction setting – there's no need to feed a wordclock signal into an ADX

unit. Set WC termination (DIP switch 5) to “OFF” when using this mode.

 WC: In this mode, channel 5 is used exclusively for wordclock transmission. ADAT5 and MIDI2 are inactive.

Note that for this mode, a wordclock signal must be input at one ADX device in the chain, and the direction of

the wordclock transmission must be set with DIP switch 1.

Use WC mode when compatibility with the former ADX-64A-PRO model's wordclock mode is required,

or when you don't have an ADAT data stream where the wordclock can be derived from.

Wordclock termination

When using a coaxial cable for wordclock distribution, the cable must be terminated correctly.

The ADX devices have a built-in termination resistor which can be switched on by DIP switch 5:

 In most configurations, wordclock termination should be “OFF”

 Switch the termination “ON” only when

- Ch5 is in WC mode and

- Ch5 set to “Input” and

- the ADX is the last device on the wordclock cable.

General requirements for wordclock termination

 The wordclock master device (the sender) should be located at the end of the BNC cable chain. If there is any

termination switch or jumper, it must be “OFF”.

 All devices in the middle of the cable (which are usually connected by “T”-shaped adapters must have their

wordclock termination set to “OFF”.

 The last device on the chain (where the cable ends) must have the wordclock termination set to “ON”. This

can either be done by setting the appropriate switch or jumper on the device, or, if there is no such thing, by

installing a “T”-shaped BNC adapter with a 75 ohms resistor attached. Different manufacturers handle

wordclock termination differently, please refer to the manual of the respective device for instructions.

WORDCLOCK

IN/OUT