Instruction manual

ACU-1000 Operations Manual
7-9
7.7 DSP-2 Replaces the RDI-1 Module
The RDI Radio Interface Module is another type of 4-wire interface module for the ACU
system and can be used to interface radios, remote control heads, or other 4-wire audio devices.
It does not contain a Digital Signal Processor, so it is lacking the DSP features of the DSP-2.
The RDI does contain a serial port (while the DSP-1 did not). This made the RDI-1 useful for
some special applications. The DSP-2 also has an RS-232 serial port. This fact, along with
component obsolescence, makes the DSP-2 an ideal replacement for the RDI-1.
Please contact Raytheon for any applications that require a serial port for control of radios or
other communications devices.
7.8 PSTN-2 Replaces the PSTN-1 Module
The PSTN-2 Phone Interface Module is functionally equivalent to the PSTN-1 with the
exception that the Line 2 RJ-11C jack on the front panel has been removed and all 4-wire
interface functions have been deleted. The PSTN-1 and PSTN-2 both have the identical
module identification code and the CPM module treats them the same. The 4-wire setup
options in the configuration screen, while applicable to the PSTN-1, will be ignored by the
PSTN-2 which will remain in the default 2-wire mode.
Please contact Raytheon for any applications that require a 4 wire interface.