40
command 06H "common
mode enable bit” is 1
command 10H will write the data
that needs to send to the continuous
area with starting address of
universal mode sending data
to
command 06H write the length
of the data to address of "The
universal send data length"
command 06H changes "the
General
sending data label
The gateway will store the received HART frame
in a continuous region started in the address of
“universal receiving data” and write the length of received data in the "Universal received data length"; Then,
change the value of universal receive label ". If no data is received within the response waiting time, the gateway
will order "universal reception error counter" to plus 1. Before sending the general frame, all users should read the
universal receive label and the error counter; After finishing to send the general frame, it needs to read these two
values continuously until one of them changes..
5.3 Trigger Command
User can use MODBUS command to trigger any HART command which is configured by gateway.
The
specific approach is: using command 6 of MODBUS to write to the "trigger command number" with wanted
trigger user command number (when configuring commands with HT-123, the software will automatically
calculate and display it) ; Then rewriting "the trigger label" to let the value change can trigger the gateway to
finish one trigger operation; The response data block in the device will be stored to "the reception data memory"
which specified by this command number.
