DACS App Note

RIU (Version A & B) Digital Outputs: Driving LED & PTT input (#17)

Application 1: Driving an LED Using RIU Digital Outputs

Note: Applies to RIU versions A and B (indicated by part number: RIU-x-A, RIU-x-B, C21x-A, C21x-B) only.
Notes
  1. Circuit depicted is for RIU with 4-channel option. For standard 2-channel RIU, DO2 and DO3 are not active.
  2. Current through each DO circuit must not exceed 50 mA. Customer must select R(lim) and LED accordingly. Assume RIU DO circuit internal resistance of 5 ohms referenced to power return.
  3. Distribution of voltage is application-specific, and is provided by the customer.

RIU Pinout Information

Includes both Circuit Card Header and Enclosure Connector. Typical each header or connector (Qty 2 or 4).

Signal Description Circuit Card
RIU Circuit Card
Audio/Interface
Port, typical
Enclosure
RIU Front Panel
Audio/Interface
Port, typical
Digital Output 1 1
Digital Input 2 6
Audio Out, Hi 3 2
Ground 4 7
Audio Out, Lo 5 3
Ground 6 8
Audio In, Hi 7 4
Ground 8 9
Audio In, Lo 9 5
n/c 10

Power & Ground Connection

Connection: Solder posts
Location: Lower left corner, next to J7 header
12VDC GND available on RIU Enclosure DB9 connector
12VDC NOT available on RIU Enclosure DB9 connector




RIU with Enclosure

Audio / Interface Port, typical
Connector Type: DB9, Female
Front Panel Designation: A, B, C, D

Front view


RIU Circuit Card

Audio / Interface Port, typical
Connector Type: 10 position Socket Header, 0.100 inch grid
Front Panel Designation: J1, J2, J3, J4

Top view


Application 2: Using an RIU DO to provide a Press-to-Talk (PTT) signal to an audio device requiring a PTT input

Note: Applies to RIU versions A and B (indicated by part number: RIU-x-A, RIU-x-B, C21x-A, C21x-B) only.
Notes
  1. RIU DO draws 50 mA max current. Add in-line resistor if necessary.
  2. Pinouts given for DB9 on RIU with enclosure and 10-pin header on circuit card.