64 Digital Outputs; Using The Scsi Connection - Worldcast Systems RELIO User Manual

Relio 4.2.x User Manual – 07/2015
A.2. 64 Digital outputs
The Relio has two integrated output connectors
Each connector provides 32 open collector outputs.

Using the SCSI connection

 Schematic diagram – Normal mode
When the digital output is activated, the digital output is connected with the ground.
This mode should NOT be used with voltage only! A current limiting resistor is needed.
 Schematic diagram – Push-pull mode (user application)
In this user application, a voltage is available:
Voutput = +V if the command isn't activated
Voutput = 0V if the command is activated
Maximum: 30VDC @ 250mA.
So, for example to have 12V: +V=12V and the resistor=12V/250mA=48 ohms.
This is OK if the digital output is linked with an infinity impedance input device (I.E. no current will come
from the connected device).
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Command
Internal ground
Command
Internal ground
Page 53
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Digital output
Digital output
User application
I
+V