Pass-through Init (Service Code= 0x4E)
Pass-through Init is outlined as follows.
Offset | Field | Value | Definition |
|---|---|---|---|
0 | HART Command | 0-255 (1 byte) | HART Command Number |
1 | HART Data Size | 0-255 (1 byte) | Number of Data Bytes for Selected HART Command |
2-256 | HART Data bytes | 0-255 (1 byte) | HART Command Data |
Request Size = 2-257 bytes
The HARTIOM responds with these messages.
Offset | Field | Value | Definition |
|---|---|---|---|
Unconnected Message Header | |||
0 | Status | 32 = Busy (Queues full) 33 = INITIATE
(pass-through success) 35 = DEAD | Command Status |
1 | HART Command | 0-255 (1 byte) | Echo of HART Command |
2 | Handle | 1-255 (1 byte) | Handle Used in Query Operation |
3 | Queue Space Remaining | (1 byte) | Number of Queues Still Available for This Channel |
Reply Size = 4 bytes
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