CHAPTER 4, DIGITAL COMMUNICATION
98307600 Rev. C-1 4-1
4.0 Digital Communication
The EC9830 has three methods of digital communication, serial communication
using RS232 signals, Universal Serial Bus (USB),or discrete control over the
50-pin I/O. Discrete control is limited to lines which either command a specific
operation or indicate an operation is in progress. Serial communication allows
access to the menu structure using a terminal and also includes a library of other
specific operations. USB provides a simple way to monitor the current state of the
analyzer, and download data that has been logged to the internal FLASH memory.
4.1 Discrete Control
Two control inputs are available through the 50-pin I/O connector. They are
DOZERO and DOSPAN. These inputs will place the analyzer in either Zero mode or
Span mode, respectively, the analyzer will remain in the selected mode while the
input is active. When these inputs are made active the analyzer will actuate the
valve drivers selected in the CALIBRATION MENU for CALIBRATION INTERNAL/
EXTERNAL. All other discrete connections are status outputs from the analyzer.
4.1.1 50-Pin I/O Functional Specification
The 50-pin connector on the back of the instrument will have functions assigned
to pins per the following table (Note 1):
Signal Name Number Function
IOUT3
2 Analog current output #3 (Note 2)
DOZERO
5 External input to put the instrument into the zero
mode.
DOSPAN
6 External input to put the instrument into the span
mode.
OVERANGE1
7 Active output indicates that analog output #1 has
gone into over-range.
OVERANGE2
8 Active output indicates that analog output #2 has
gone into over-range.
OVERANGE3
9 Active output indicates that analog output #3 has
gone into over-range.
ANAIN1
10 Unused analog input #1.
ANAIN2
11 Unused analog input #2.
IOUT1
15 Analog current output #1 (Note 3).
IOUT2
17 Analog current output #2 (Note 4).
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