Xylem H-4161 - Manual (Page 11)

H-4161
Installation And Maintenance 2-3
2.7 Programming the Module Mode setting
The H-4161 can either “monitor” SDI-12 communication between a data logger and its sensors, or
“initiate” measurements to a dedicated sensor connected to the auxSDI-12 terminal. The H-4161 comes
from the factory with Module Mode = 0 (monitor). The extended commands to examine or change the
Module Mode are explained in Chapter 3.
2.8 Programming the Monitored Address setting
As a data monitor, the H-4161 passively monitors communication between the data recorder and its SDI-
12 sensors. The H-4161 waits for, and collects data from a specified sensor. The data recorder must
initiate any sensor measurements. The H-4161 comes from the factory with the Monitored Address = Z.
If you wish to monitor data from another sensor you must change the monitored address to the desired
value. This setting is not used if Module Mode = 1 (initiate). The extended commands to examine or
change the Monitored Address are explained in Chapter 3.
2.9 Programming the Monitored Parameter setting
Each SDI-12 sensor can make up to nine separate measurements or “parameters”. The data recorder
collects the measurement data using “aD0!” - “aD9!” commands. The Monitored Parameter setting
controls which of the nine data parameters is to be monitored by the H-4161. The H-4161 also monitors
the data sent in response to the new concurrent SDI-12 V1.2 “aR0" data collection commands. The H-
4161 comes from the factory with Monitored Parameter = 1. This setting should work with most
sensors. The extended commands to examine or change the Monitored Parameter are explained in
Chapter 3.
2.10 Programming the AutoScan Command setting
When the Module Mode =1 (initiate), the H-4161 actively initiates measurements and collects the
response from the sensor attached to the auxSDI port. The H-4161 normally issues an “0M!” command
to the auxSDI port. If desired, the H-4161 can be programmed to issue other commands such as “0M1!”
(“0M1" to “0M9!”). The extended commands to examine or change the AutoScan Command are
explained in Chapter 3.
2.11 Programming the Measure Rate setting
When Module Mode = 1 (initiate), the H-4161 initiates measurements to the sensor attached to the
auxSDI port. The measurement interval is controlled by the Measure Rate setting. If the Measure Rate
is set to a value less than the time it take to make the actual measurement, measurements will be made
back-to-back, as fast as possible. The H-4161 comes from the factory with Measure Rate = 0 (seconds).
This setting is not used if Module Mode = 0 (monitor).