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DACS App Note

RIU (Version C & later) Digital Outputs: Driving LED, ext. relay or working with AIU (#17b)

Application 1: Driving an External LED Using RIU Digital Outputs

Note: Applies to RIU version C and later (indicated by part number: RIU-x-C) only.


Notes
  1. RIU DOs can be directly connected to loads (as shown). RIU DOs can also be connected to a load through the DO jack of an Audio Interface Unit (AIU). The connection through the AIU is passive. Connecting the load to an AIU can simplify cabling configurations. Application 3 below shows how to connect an RIU DO to a load through an AIU.
  2. Typical Digital Output circuit is depicted. See Parts 4 & 5 below for RIU and AIU pin assignments. Digital Outputs are optically isolated solid state switches.
  3. Current through each DO circuit must not exceed 75 mA.

Specifications
  1. Vcc (max) = +30 VDC
  2. Vcc (min) = +3 VDC
  3. IDO (max) = 75 mA
  4. Rlim (minimum value) = (Vcc - 1.7)/0.075

Application 2: RIU Digital Outputs. Driving external relays, RIU only (no AIU).

Note: Applies to RIU version C and later (indicated by part number: RIU-x-C) only.


Notes
  1. Typical DO circuit is depicted. See Parts 4 & 5 below for RIU and AIU pin assignments.
  2. DOs are optically isolated solid state switches.
  3. Current through each DO circuit must not exceed 75 mA. The resistance of the relay coil is critical (see Specifications).
  4. Protective diode CR1 is necessary. Select a relay with an internal protective diode or use a discrete diode, 1N4001 or equivalent. Failure to use a protective diode may result in damage to the RIU.

Specifications
  1. Vcc (max) = +30 VDC
  2. Vcc (min) = +3 VDC
  3. IDO (max) = 75 mA
  4. RCOIL (minimum value) = (Vcc - 1.7)/0.075

Application 3: RIU Digital Outputs. Connecting RIU DOs through an AIU.

Note: Applies to RIU version C and later (indicated by part number: RIU-x-C) only.


Notes
  1. Typical DO circuit is depicted. See Parts 4 & 5 for pin assignments.
  2. DO circuits are passively routed through the AIU.
  3. Current through each DO circuit must not exceed 75 mA. The load resistance is critical (see Specifications).

Specifications
  1. Vcc (max) = +30 VDC
  2. Vcc (min) = +3 VDC
  3. IDO (max) = 75 mA
  4. RLOAD (minimum value) = (Vcc - 1)/0.075

Part 4: AIU pin assignments

Note: Applies to RIU version C and later (indicated by part number: RIU-x-C) only.

Audio Interface Unit
"Audio Source" Jack
Audio Interface Port, with Digital Interface
Connector Type: DB9 female

Front View

Audio Interface Unit
"DO" Jack
Digital Output Port
Connector Type: 3.5mm, 2 Cond., female




Signal Description AIU Panel
"Audio Source"		 AIU Panel
"DO"
Digital Output + 1 Tip
Digital Output - 6 Ring

Part 5: RIU pin assignments

Note: Applies to RIU version C and later (indicated by part number: RIU-x-C) only.

Remote Interface Unit
"CHAN [A,B,C,D]" Jack
Audio / Interface Port, with Digital Interface
Connector Type: DB9 female, typical

Front View


Signal Description RIU Panel
"CHAN [A,B,C,D]"
Digital Output + 1
Digital Output - 6

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