CAI 700 NDIR, Operator'S Manual

Page: 141 / 205

700 NDIR Analyzer 6-20-2017
141
Analog and Digital Interface
Hardware Capabilities of Main and Aux Connectors
Analog Output
The operator can choose one of the following output types:

As voltage outputs – 0 to 1V, 5V or 10V

As current outputs – 0 to 20 mA or 4 to 20 mA
When set as current outputs, the maximum drive voltage provided by the analyzer is slightly
more than 20 Volts, requiring that the maximum loop resistance does not exceed 1,000 Ohms.
The Isolated Analog Ground (Main, Pin 1) is the only pin that should be used as the return line
for the four analog outputs.
See Programmable Analog Output Adjustments .
Digital Output
There are two types of digital outputs:

Static Digital Outputs – Permanently assigned to often-needed functions. These are opto-
isolated, solid-state Normally Open (NO) relays that connect to the Digital Ground
(Main, Pin 6 and Pin 28).

Programmable Digital Outputs – Have dedicated returns for each block of four outputs.
Refer to the Aux Connector Pinout chart below to determine which pin is used for the
corresponding Programmable Digital Output. When the output is programmed as a status
it will close to indicate the function. When programmed as an alarm the output will open
to indicate an alarm.