Dolby Laboratories DP524 - Manual (Page 18)

3-4
3.4.1 Jumpers for Encoded Data In & Timing (J103)
Receive Timing J205 / Receive Data J206 [terminated]
Termination resistors (150 ohms) are provided across the "RT" and "RD" inputs.
These inputs are terminated in the default configuration, which should be
appropriate for most applications. Certain situations may require that these inputs
be unterminated (e.g., multiple inputs driven from a single output).
Request to Send J207 & J208 / Terminal Ready J209 & J210 [on]
Handshake signals "RS" and "TR" can be turned on or off, depending on the
application. The default settings for these signals is "on."
3.4.2 Signal Ground-to-Chassis Link J3 [open]
It is normal practice to connect signal ground to power line ground for many
reasons, including safety. In most systems, minimum induced hum is obtained when
this connection is made at one and only one piece of equipment in the audio chain.
To minimize the addition of circulating ground currents in a particular installation,
the default setting is for this jumper link to be open. Note that there is always a 1k
ohm resistor across the link so that the audio ground is never totally isolated from
the chassis ground. To connect audio ground directly to chassis ground in the
DP524, move jumper J3 to the closed position (move jumper towards the front of
the unit).
CAUTION The chassis is always connected to the ground pin of the power line cord. For safety
reasons this ground wire MUST NEVER be disconnected.
3.5 Configuring the Rear Panel DIP Switch S101
The Model DP524 includes certain user-selectable options that are configured by
means of a rear panel DIP switch, S101. Some of them should be configured prior
to first use. Others can be changed as operational needs dictate (See also Section 5,
Operation).
The default settings (delivered from the factory) are shown in brackets in the table
below. Before installing the unit, be sure to verify that the switch positions are in
their desired positions. Explanations follow below.
S101 Switch No. Function Up (On) Down (Off)
1 Test Tone Tone on [Normal]
2 Download/Normal Download [Normal]
3 AES/EBU / S/PDIF [AES/EBU] S/PDIF
4 Command/Aux data mode Command mode [Aux Data mode]
5 Baud rate select 1 See below [See below]
6 Baud rate select 2 See below [See below]
7 Test Tone sample rate 1 See below [See below]
8 Test Tone sample rate 2 See below [See below]
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