6
PROGRAMMABLE OUTPUTS
- 8 of the 13 programmable pins can be configured to work as “outputs,” which are
used to indicate the state of a programmable input. For example, an LED can be driven from one of these output
pins to indicate activity at one of the audio inputs. Each of the 8 programmable outputs is the electronic equivalent of
a contact closure. The logic output will sink up to 100mA at voltages up to 40VDC, however, the total current draw of
all logic outputs should not exceed 100mA if the in5V supply in the DSP4/4 is used.
RS-232 SERIAL PORT
- Provides access to and control of some of the operational features of the DSP4/4. The port
is compatible with the serial port of a PC, or other controllers with RS-232 type serial ports. For hardware intercon-
nection and software details, see Appendix 1, “Serial Port Hardware and Software”.
EXPANSION IN/OUT
- Allows other LecNet devices to be connected to the DSP4/4. Also used when multiple DSP4/
4s are connected together to bus the RS-232 serial connection between DSP4/4s.
Pin
Expansion In Function
Expansion Out Function
1
Main In
Main Out
2
Mix Minus Out
Mix Minus In
3
NOM In
NOM Out
4
NOM Total
NOM Total
5
RS-232 RX
RS-232 RX
6
RS-232 TX
RS-232 TX
7
Ground
Ground
8
N/C
N/C
PWR IN
- Connects to the CH40 (for the DSP4/4) or the PS60 (for the DSP4/4 DUAL) power supply to provide power
for the unit.
DIFFERENCES BETWEEN THE DSP4/4 AND THE DSP4/4 Dual
The DSP4/4 Dual is simply two DSP4/4s in one box sharing a common power supply. Audio inputs and outputs are
labeled 1A through 4A on one unit and and 1B through 4B on the other unit. There are no internal bus connections
between the A and B units. Each unit operates as an independent device with a unique serial address. The follow-
ing outlines the important differences between the DSP4/4 ad the DSP4/4 Dual.
LecNet Port and LecNet Address
A DSP4/4 has a single LecNet address whose factory default is 143. A DSP4/4 Dual has two LecNet addresses
whose factory defaults are 143 (for channels 1A-4A) and 144 (for channels 1B-4B). Both addresses for the DSP4/4
Dual are accessible from the LecNet port on the DSP4/4 Dual.
Programmable Inputs and Outputs
The DSP4/4 Dual has two 15 pin D-sub connectors for the programmable input/output function. Each of the connec-
tors controls only the four channels with which it is associated. For example, assume a programmable input is set
for the preset recall function. In order to recall a preset for all eight channels of the DSP4/4 Dual, the programmable
inputs should be at both LecNet addresses should be set to the recall preset function. In addition, the contact
closure to ground to effect the preset recall should be electrically connected to the programmable inputs on both
connectors.
Power Supply
The DSP4/4 uses a Lectrosonics CH40 power supply. The DSP4/4 Dual uses the Lectrosonics PS60 power supply.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
OUT
IN
EXPANSION