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Ammonit Data Logger Manual
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Ammonit GmbH / 2005 - 2009
2.13. Logger cascading
In addition to external Modbus-modules, it is also possible to link up further
Ammonit Data Loggers if the of a single unit does not have enough input
channels, or if the measurements from two devices operating close to one
another are to be exactly synchronised and read out in a single data-set via the
same interface. In this case the appropriate cascade channels of the "Master“
Logger are activated and definitions are entered for each channel under
"Settings“:
Address: Number of the Slave Logger(s)
Register: Number of the required channel
(Speed 1 = 1, Speed 2 = 2 etc.)
The "Slave"-logger is cascaded via the RS485-interface and the parameters
must be set as usual (enter measurement interval, activate channels, enter
slope and offset, etc). In addition it is necessary to set the following:
Logger number: Value between 95 and 99
(matching the address in “Master”)
“Slave” mode: Activate (see “Settings” / “RS485 Options”)
Please note that:
•
When the logger is in “Slave” mode no other functions are allowed via
the RS485-interface (Sonics, Scada-output, etc. must be switched off)
•
A logger in "slave“ mode draws a constant 50 mA, because it can no
longer revert to standby status in the breaks between measurements.