OM-CP-RF Series Operations Manual
Omega Engineering, Inc.
Revised 04/07/05
Page 7 of 18
3.
Staggering transmissions from multiple devices
– If several devices need to
record data at the same time while transmitting the output in real time, this option
can be used to ensure that at least one transmission from each device is sent
without interference from the other devices. This is similar to the randomization
option provided above, but is better suited to some applications. See “Using Multiple
Devices” later in this manual.
Indicator Mode
The device may be configured to blink the LED activity indicator every 10 seconds (the
factory default setting) or only when a scheduled reading is taken. The green LED indicator
will blink to indicate that the device is configured properly to allow a wireless transmission
to occur. If the wireless transmitter is disabled by any of the available configuration options
(by setting the transmitter output mode to disable the wireless output, or by selecting either
of the related transmitter control options), the indicator will not blink. When a wireless
transmission is about to be sent, both the green and the red LED indicators will blink.
The primary reason to turn off the 10-second indicator is to conserve battery capacity.
See “Battery Life” later in this manual. The 10-second mode is forced “on” if the custom
transmit interval discussed above is enabled.
REGISTERING THE DEVICE ON A SYSTEM
Before the Omega software will receive data from an OM-CP-RF-series transmitter, the
device must be properly registered on the system. When the device is identified or
configured, the PC software will store an image of the device for future reference. This
image is stored on the PC’s hard disk so it is retained even when the software or PC is shut
down. The software then refers to the device image when receiving a transmission to “fill in”
the information that is not transmitted in the data packet. This information includes the
device ID, calibration data, and measurement variables such as a thermocouple type or
engineering units. The data packet contains a checksum of critical settings to ensure invalid
data is not displayed. For this reason, the device must be re-registered if it is calibrated or
the measurement data is changed on another PC.
STARTING THE DEVICE AND SYNCHRONIZING THE TRANSMITTER
Like other Omega data loggers, the OM-CP-RF series devices must be configured
through a PC. The wireless transmitter is primarily set up through the “Wireless
Configuration” dialog discussed previously, but synchronization of the transmitter to the
desired starting time is accomplished through the “Start Device” dialog when launching the
data logger. When launching, choose the start time, and set the logger parameters (device
ID and reading rate) for the run. When the device is started, both the logger and
transmitter time base will be set for the selected start time. They will remain inactive until
the selected time, and then begin to operate as configured in the “Start Device” and
“Wireless Configuration” dialogs. When the delay-start time arrives, the logger will take
readings (if enabled) at the programmed reading rate, and wireless transmissions (if
enabled) will be made at the reading rate or custom interval, depending on how the device
is configured.
If a delayed start is specified, the device will remain completely inactive during the start
delay period. The indicators will not blink, no readings will be taken and no transmissions
will be sent. It will continue to communicate normally, and may be queried, stopped, or
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