Description of the APS
TM
Spectrometer 3-7
Serial Port
The Serial Port is a standard RS-232 serial connection that allows
communications between the system computer and the Model 3321 APS™
spectrometer. Serial commands are sent to and from the computer to
provide instrument status and collect data information.
If you are developing specialized software for the APS™ spectrometer or
performing troubleshooting, refer to Appendix C, "Using Serial Data
Commands,". This appendix provides a complete description of the Serial
Data Commands, as well as signal connections.
I/O Port
This 15-pin, D-subminiature connector port provides three digital input and
three digital output pins. It allows various signals to be sent to a data logger
or control switches. Refer to Appendix C, "Using Serial Data Commands,"
for serial commands to control the I/O Port. This port also has two analog
input pins to allow data logging of analog voltages for external devices
such as temperature sensors or relative humidity sensor.
Figure 3-5
I/O Port Pin Designations
Table 3-2
Signal Levels for I/O Port Configurations
Pin Number I/O Signal Levels
1 Digital Input 1 0, 5V
2 Digital Input 2 0, 5V
3 Digital Input 3 0, 5V
4, 5 Digital GND Ground
6 +5V Digital Supply Out 5V
7 Analog Input 1 0 to 10V
8 Analog Input 2 0 to 10V
9, 10 Digital GND Ground
11 Digital Output 1 0, 5V
12 Digital Output 2 0, 5V
13 Digital Output 3 0, 5V
14 Digital GND Ground
15 Analog GND Ground
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