Mitsubishi Electric M330 User Manual download pdf (Page 64)

Detailed Description of the Module Buffer Memory

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3.5.26 HART Command Answer (Un\G496 to Un\G627)

HART Command Answer Flag (Un\G496)

● The high byte (b8 to b15) of Un\G496 forms the HART Command Acceptance Flag. As a reaction

of a HART Command Request (refer to

section 3.5.25), the HART device writes one of the following

two values into this byte:

"0": Command not accepted or no request

"1": Command accepted

●

The low byte (b0 to b7) contains the HART Command Execution Complete Flag. This byte has also

only two states and is written by the HART device:

"0": Command not complete or no request

"1"': Command complete.

HART Command Answer Channel (Un\G497)

● The channel number which has received the subsequent HART Command Answer is stored in the

low byte of Un\G497.

● Range for the channel number: 1 to 6

HART Command Answer Code (Un\G498)

● Stores the HART command from the device's answer

HART Command Answer Data Size (Un\G499)

● Stores the amount of valid data in the HART Command Answer Data Buffer (Un\G500 to Un\G627).

HART Command Answer Data (Un\G500 to Un\G627)

● The received data from the device according to HART specification is stored in these 128 buffer

memory addresses.

● The first two bytes are the device's status.

Fig. 3-33:

Un\G496 is shared by the Execution Acceptance Flag and the Execution Complete

Flag

Fig. 3-34:

The low byte of Un\G497 indicates the channel No.

b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

Un\G496

Execution Complete FlagExecution Acceptance Flag

b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

0Un\G497 0 0 0 0 0 0 0

Information of b8 to b15 is fixed to 0.

HART Command Answer Channel

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 115 116

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Mitsubishi Electric M330 User Manual Page 64