SMAR HI302, Руководство пользователя

Страница: 77 / 92

Appendix B
B.1
HART Command Configuration in FLASH memory
HIRT Block
When the device is identified by the command selected in the HIRT.ID_CMD, the HI302
module will send sequentially all the reading commands in the configuration selected in
the HIRT.HCD_SEL.[1] parameter. Since this set of commands includes some Common
Practice commands, the device may not support all the sent
commands, causing, then,
retransmission and time waste in the communication. In this case, it is necessary for the
user to identify the command
in the table below and to configure the command index not
supported by the HIRT.COMMOM_CMD_CTRL parameter. This parameter is a filter with
10 positions and because its indexes are not executed, a faster HIRT update process with
no retransmission is generated. For example, to not send the HART 48 command (READ
ADITIONAL STATUS), just write the 24 index in the HIRT. COMMON_CMD_CTRL.[1]
parameter.
Sent HART Reading Command used by the HIRT Block
Index
HART
Command
Description
12 1 PV Reading [EU].
13 2 Current reading (mA) and PV reading in percentage.
14 3 Read the loop current (mA) and the PV, SV, TV, QV [EU].
16 12 Read the message.
17 13 Read the TAG, DESCRIPTOR and DATE.
18 14 Read the information about the PV sensor.
19 15 Read the information about the PV analog output.
20 16 Read the FINAL ASSEMBLY NUMBER.
24* 48* Read the ADDITIONAL STATUS INFO.
37* 33* Read the dynamic variables through the code.
*Common Practice Command. May not be implemented in the device.
Identification HART Commands
Identification commands are those used to get the device’s initial data, such as its long
address. The HIRT block may use the following commands:
Index HART Command Description
11 0 Use the polling address .
36 11 Use the device TAG.
38 21 Use the long TAG (only on the HART version 6).
HART Writing and Execution Commands used by the HIRT Block
The execution commands are those for which the module does not wait a response
containing data that can update the block parameter. An example of execution command
is the RESET command of the device.