14
4
Channels
The Messenger maps all monitored conditions into channels. Each channel has data
storage and configuration parameters. Data storage holds current value, max/min
values, and other run time data values. Configuration consists of user settable
parameters that define rules on how the data values are to be processed (
).
Every channel in the Messenger is referenced by a fixed channel number, e.g. RPM is
always channel 52. There is a set of pre-defined channels (numbers 1-300) and a set of
Modbus channels (numbers 301-900). The Modbus channels are user configurable for
reading/writing digital or analog values from a Modbus RTU slave device.
4.1
Defined Channels
The following channels are pre-defined in the Messenger:
Table 1: Pre-Defined Channels
Channel
Number
Channel
Name
Type
Description
Start Digital Channels (data values are ‘0’ or ‘1’)
1
Cell
Digital
(System)
Status of cellular modem operation
•
1=fault
•
0=normal
2
Comm
Digital
(System)
Status of any serial port used for
communications with external device
(MODBUS Master, Slave, or proprietary)
•
1=fault
•
0=normal
4
User DIN1
Digital
•
0 – On AC power
•
1 – On Battery power
Start MODBUS Channels
301-900 Modbus
User
Defined
Analog or Digital channels read from
Modbus RTU Slaves
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