ACOEM Met One Instruments GAS-1060, User Manual

Page: 68 / 164

Serinus 60 User Manual 3.0
Page 68
4.4.2 Analog Inputs
The instrument is also equipped with three analog inputs with resolution of 15 bits plus polarity,
accepting a voltage between 0-5V. These go directly to the microprocessor and should be protected
to ensure static/high voltage does damage the main controller PCA (instrument warranty does not
cover damage from external inputs).
4.4.3 Digital Status Inputs
The instrument is equipped with eight logic level inputs for the external control of the instrument
such as Zero or Span sequences. Each input has a terminating resistor which can be either PULL UP or
PULL DOWN. This is set using the jumper JP1 on the back panel PCA (refer to Figure 17).
4.4.4 Digital Status Outputs
The instrument is equipped with eight open collector outputs which will convey instrument status
condition warning alarms such as no flow, sample mode, etc. Two of the digital outputs can be set so
that there is +5V and +12V available on the 25 pin connector for control purposes, instead of digital
outputs 0 and 1.
In the default jumper locations (refer to Figure 10) these two outputs will function normally as open
collector outputs. If moved to the position closer to the 25 pin connector then the DO 0 will supply
+12V and DO 1 will 5V.
The +12V and +5V supplies are limited to about 100mA each.
Each digital output is limited to a maximum of 400mA. The total combined currents should not
exceed 2A.
Figure 17 – 25 Pin Rear Panel PCA (Default Jumpers Highlighted)