
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 224
If User Interface accessibility is periodically disrupted by your
configuration, you have two options: 1) attempt to simplify the configuration
to reduce timing stress, or 2) send more than one polling command to the
ZENO
®
-3200 until you gain access to the User Interface.
12.2. THE UNIVERSAL SERIAL INTERFACE
The Universal Serial Interface (USI) allows for programming the ZENO
®
-3200 to communicate with
serial sensors using ASCII communications, which includes multiple poll-response commands,
unsolicited data from the sensors and built-in checksum verification.
The USI largely retains the ZENO
®
-3200’s existing menu-driven environment. Poll and response string
formats are described using the C language printf formatting.
261
Asynchronous sensors, with no
polling command, are also permitted. String, floating-point and long integer values can be read, logged,
and transmitted; floating-point values can also be processed, with very limited processing permitted for
the long integer values.
The ZENO
®
-3200 is designed to retrieve data from a finite number of serial sensors.
Since there is no universal standard that would allow communication to any
type of sensor, the USI provides a generic means of retrieving data from
most serial sensors.
12.2.1. Three Menus Are Used To Configure The USI
Three separate menus are required to configure the Universal Serial Interface:
The Sensor Menu to specify a Universal Serial Sensor.
262
The General Serial Script Menu to create the Script Record that provides parsing interface between
the ZENO
®
-3200 and the serial sensor.
263
The Memory Management Menu to specify the amount of RAM memory required for the
communications port configured with a General Serial Sensor.
264
12.2.2. The Sensor Menu
To set up a Universal Serial Sensor, start with the standard ZENO
®
-3200 Sensor Menu, and choose the
Sensor Type Code to be 16 (Universal Serial). The following Sensor Menu will then appear:
261
The C Programming Language, Dennis W. Kernighan and Dennis M. Ritchie. Prentice Hall Software Series:
1988.
262
Refer to Section 12.2.2.
263
Refer to Sections 12.2.3 and 12.2.5.
264
Refer to Section 12.2.4.
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