GAS BreathSpec, Руководство пользователя

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BreathSpec®
– User Manual
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6.5.3 Managing Modbus TCP Setup
GAS Devices can output their results via the Modbus TCP protocol. The Registers
can be set up on your device’s
Substances page . When selecting a substance from
list on the left, information about it will be displayed on the right. This includes the
registers it will be mapped to. Every substance will require a fixed set of registers, so
the total of number substance information which can be transferred over the Modbus
is limited. Registers for different substances cannot overlap. In case you try to
overlap them, you will be informed by an error window, about which registers in
specific have been assigned twice. Using the
Enabled button, you can select or
deselect substances for evaluation. Deselecting them will result in the designated
status code in the corresponding registers. You can check the last Modbus TCP
connection to your device in
System > Transfer > Modbus TCP . It will give you
information on when and from which IP the last connection was made and whether it
is still active (Figure 35).
Figure 34: Substances Window
Figure 35:Information about the last Modbus TCP Connection
The results are put into the holding registers (40001-40250 function code FC03).
These
250 registers are divided into two 125 register long arrays which contain the
current results in the first 125 and the results from before that in the latter 125
registers. At the beginning of each of these register blocks is the information header,
which is 6 registers in size. See Chapter
9.6 Modbus TCP Specification .