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
- Circuit depicted is for RIU with 4-channel option. For standard 2-channel RIU, DO2 and DO3 are not active.
- 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.
- 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
- RIU DO draws 50 mA max current. Add in-line resistor if necessary.
- Pinouts given for DB9 on RIU with enclosure and 10-pin header on circuit card.
