Technical data

www.asti-usa.com ASTi DACS: Operation & Maintenance Manual (Version 4, Rev. B.1)

Control Panel and External Serial Device Connection: For those applications which require

connection of a Hand Held Terminal, an operator control panel, simulated radio panel, or other

serial device, no special hardware conﬁguration is required.

Note that serial port connection is only available for legacy RIU versions D and up, and the DACS

must be running Model Builder version 4.0 or later.

Prior to connection of the panel or device, the user should consult any installation drawings or

notes provided by ASTi to ensure that panels are connected to the correct TDM ring, RIU, and

Serial Port. Failure to do so may cause improper routing of cell data.

Devices are connected to one or both of the two available RIU serial ports. Ports are marked A and

B. Interface is standard RS422. Connectors are standard RJ12. See also Appendix A for additional

interface information.

TDM Ring Conﬁguration: Once each of the RIUs are conﬁgured and mounted, the TDM ring

itself can be constructed. This is accomplished by connecting standard category 5 UTP network

cable between the TDM controller in the DACS and the ﬁrst RIU on the ring. The next RIU is then

connected to the previous RIU and so on until the last RIU is connected to both the previous RIU

and the original TDM card, forming a ring which begins and ends with the TDM controller.

Both the TDM card and the RIU have two female RJ-45 connectors for connecting standard cate-

gory 5 UTP network cable. Either connector can be used on the RIU and TDM card when install-

ing the ring.

Repeat this procedure for each TDM card in the DACS.

Note that up to 14 RIUs can be placed on a ring, but only a maximum of 24 audio channels can be

serviced. Other factors such as model complexity and DSP or CPU loading may further limit the

actual number of audio channels serviceable by the ring. Refer to Application Note 30A on the

ASTi website for additional information.

Power Connection: An external AC/DC converter is provided with each RIU. The converter

plugs into a standard 120VAC outlet. Power required is 5VDC as noted on the RIU face plate.

Connect power to each RIU. The Red power LED should light brieﬂy when power is applied.