
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 117
6.9.2. SDI-12 Passthrough Mode
The SDI-12 Passthrough Mode lets you interact directly with SDI-12 sensors connected to the ZENO
®
-
3200.
Terminal Passthrough Mode cannot be used to communicate with SDI-12
sensors because of unusual timing requirements and special characters used
in the SDI-12 protocol. SDI-12 Passthrough Mode manages the timing
requirements and special characters so that you can send specific SDI-12
commands to one or more SDI-12 sensors connected to the ZENO
®
-3200.
Since SDI-12 Sensors are connected via RS 485, only COM2 and COM3 support them on the ZENO
®
-
3200. Typically, COM3 is the User Interface COM Port and the SDI-12 Sensors are connected to the
RS485 interface of COM2.
Entering SDI-12 Passthrough Mode is done via the Test Menu in the User Interface. To enter the Test
Menu, type T{ENTER} from the User Menu, then type P{ENTER} to go into SDI-12 Passthrough mode.
USER MENU
(C) Communications Menu (T) Test Menu
(F) System Functions Menu (Z) Zeno Program Menu
(S) Sample Period Menu (Q) Quit
(D) Data Retrieval Menu (H) Help
> T
TEST MENU
(Rx,y) Display Sensors x-y RAW Data (Ex) Display Sensor x Error Codes
(Sx,y) Display Sensors x-y SCALED Data (P) SDI-12 Pass-Through Mode
(Cx) Calibrate Sensor Record x (U) User Menu
(Vx) View Process Record x (Q) Quit
(D) View Data Collection Counters (H) Help
(B) Display BIT Status
> P
Enter the SDI-12 COM port (COM2 or COM3):
Like Terminal Passthrough Mode, the ZENO
®
-3200 continues with normal
data collection, EXCEPT for any serial sensors connected to COM2 (or any
Data Output messages going out on COM2).
When you enter SDI-12 Passthrough Mode, ZENOSOFT
®
will ask you which COM port to use. The
only choices are COM2 or COM3. No other questions are asked since SDI-12 communication parameters
are already defined.
Since SDI-12 sensors cannot accept data at a human’s typing rate, as it would be too slow, the ZENO
®
-
3200 buffers data and then sends the commands to the SDI-12 sensor. The ZENO
®
-3200 then returns the
SDI-12 response to the User Interface COM Port, whereupon it is typically displayed to the screen. Any
white space and non-printable characters will be represented by their hexadecimal ASCII codes inside
angle brackets (refer to Appendix A for a complete list of ASCII codes). When you enter the command to
send to the SDI-12 sensor, you may omit the final exclamation mark.
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