
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 75
After connecting and powering up the ZENO
®
-3200 as described in Section 2.2, type U to enter the USER
Menu. You should see the User Menu in your terminal emulation program.
USER MENU
(C) Communications Menu (T) Test Menu
(F) System Functions Menu (Z) Zeno Program Menus
(S) Sample Period Menu (H) Help
(D) Data Retrieval Menu (Q) Quit
6.1. BASIC COMMUNICATIONS SETTINGS
The ZENO
®
-3200 contains three independent UARTs.
80
Each UART is referred to as COM1, COM2 and
COM3. The settings and use of each UART (or COM port) are completely independent. COM1 and
COM3 are dedicated ports, but COM2 is multiplexed
81
so that it can communicate with up to four
different devices without interference between them.
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Only COM2 can be used for both data collection from serial sensors and as a
unidirectional communications link simultaneously.
Conversely, COM1 and COM3 can only be used as one or the other.
If you require COM2 to both collect data and perform as a general
communications link, Coastal Environmental Systems recommends that you
use COM2 to transmit data only for the communications link.
Bi-directional communication will interfere with data collection to the serial
sensor(s) because two or more actions cannot share the same resource
simultaneously. (Refer to Section 12.1.8.)
If COM2 is set up to collect data from a serial sensor(s) AND act as a
communications link, it cannot do both at exactly the same time.
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A UART (Universal Asynchronous Receiver/Transmitter) is a single integrated circuit chip that contains circuitry
for both receiving and transmitting asynchronous serial communication.
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A multiplexer is a switching device that allows a single communications port to view multiple streams of data
without interference between the different streams. It can only view one stream at a time. As an example, the
channel selector on a television set is a multiplexer.
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This is illustrated in Section 2.5.
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