Dionex AS-HV, Operator'S Manual

Page: 17 / 122

2 • Description
Doc. 065125-01 10/06
9
I/O Port
The I/O port provides eight contact closure inputs and four relay
outputs.
The autosampler has four internal relays (A, B, C, and D).
Normally open and normally closed contact pairs are available on
the external I/O connector.
Relay A is reserved for control of the internal peristaltic pump.
Relay B is reserved for control of an external relay-controlled
pump operating as the sample loading pump. The relays can be
controlled through commands programmed in Chromeleon.
RELAY Status Indicators
These indicators light (yellow) to indicate the
state of the internal relays (A, B, C, and D).
When a relay is energized, the corresponding
indicator is lit.
The relay outputs can be used to connect and control low power devices. These
outputs should be limited to loads of 1 amp or less. The eight digital inputs
available on the autosampler allow monitoring of electrical signals between 0 and
+24 volts.
System Status Indicators
These indicators light (yellow) to identify certain
autosampler conditions. For details, see the table below.
.
Status Indicator Description Indication
S1
Programmable behavior
LED ON when programmed
AUX Auxiliary instrument port
activity LED ON when a byte is sent or received
on Auxiliary Instrument Port, then
OFF
HOST
Host interface port
activity LED ON when a byte is sent or received
on Host Interface Port, then OFF
CPU Central processor unit
(CPU) activity LED OFF for 10 seconds, then ON for
1 second