BSS Audio sw3088 Install Guide - Manual (Page 5)

Soundweb 3088 Installation Guide
5
Mains inlet
IEC power connector, for connection to mains supply (100-270V AC, 50/60Hz).
Mains fuse holder
Requires a 20mm T1AL type fuse. Do not replace with anything other than the
recommended fuse.
Aux. RS232
An alternative connection for a control PC, modem or AMX/Crestron type panel. This port
works at up to 115200bps. Note that AMX panels only currently connect at 38400bps.
Pinouts
1 -DCD
6-DSR
2-RX 7-RTS
3-TX 8-CTS
4-DTR 9-N/C
5-GROUND
Control Inputs
Used to connect switches or potentiometers, e.g. 9012 selector wallplate (Part no.
Z-SW9012). Looking at the control port connector (on the back of the unit), there are two
common (ground) connections “C” to the left of the eight CONTROL INPUTS and, two
software assignable reference voltage outputs “R” to the right.
The control ports now have two modes of operation. In Soundweb Designer’s Control
Ports window these are labelled “2-wire” and “3-wire”.
2-wire mode
In this mode the eight CONTROL INPUTS are internally “pulled up” to +5V DC via a
4.7kOhm resistor. Therefore, no external voltage source is needed to create contact
closure to ground for switches such as mute buttons or, resistance to ground (for other
multi-state or continuous controls such as Parameter Presets or faders).
See the Soundweb Designer help for a table of resistor values for use with Parameter
Presets or source selectors.
Two “common” ground connections are provided using the two “C” connectors to the left
of the CONTROL INPUTS.
A 47kOhm-log potentiometer (Part no. DM10018) connected between a control input and
common will allow parameters to be controlled linearly.
3-wire mode
This mode allows the use of linear pots or faders for continuous controls. A pot would be
wired as a potential divider with the top of the track connected to the reference output
“R”, the wiper to a control input and the bottom of the track to a common “C”. For good