4-30
Chapter 4: OE2CIH and HART
User’s Manual Pub. 0300272-03 Rev. B
Reply Data
Get Single Channel Device
-
Reply packet structure
Reply Size = 12 or (12*
n
)
Offset
Field
Value
Definition
0
Communication Established
0×00
(1 byte)–
Not
established
0×01
(1 byte)–
Established
Indicates presence of HART
device
1
HART Comm/Cmd Response
Status byte
(1 byte)
HART Communication Status
byte (First Status byte from
device)
2
HART Field Device Status
byte
(1 byte)
HART field device Status byte
(Second Status byte from device)
3
Manufacturer ID/EDTMSB
(1 byte)
CMD#0, Byte 1
4
Device Type/EDTLSB
(1 byte)
CMD#0, Byte 2
5-7
Device ID
(3 bytes)
HART Device ID (MSB first)
8-9
Manufacturer ID 16 Bit
(2 bytes)
CMD#0, Byte 1 if HART rev
less than 7
CMD#0, Bytes 17 to 18 if HART
rev greater than or equal to 7
10-11
ExpandedDeviceTypeCode
(2 bytes)
CMD#0, Byte 2 if HART Rev
less than 7
CMD#0, Bytes 1 to 2 if HART
Rev greater than or equal to 7
12 to
(12*
n
)
Above 12 bytes repeated for
all Channels
Ramp Rate
The module uses a fixed ramp rate per channel of 100 ms full-scale. This
prevents introducing unnecessary noise during HART communications while the
outputs are commanded to large deltas.
Inter Processor Communications
Main Processor Detects Error
This module contains multiple MCUs; the main application processor, and two
HART modem processors. If, at any time, the communications between any of
these processors is disrupted for more than one (1) second, the channel enters a
hard fault state. Since the state of the HART processor is unknown, and it has
direct control over the DAC, the HART processor is held in reset. It remains in
this state until power is cycled.
The Module Status LED is set to blinking red and the Channel Status LED is set
to solid red.
The module status bit is set to
Major Unrecoverable Fault
. The entire byte of
status is set to 0×FF to indicate a hard fault on the channel.
Содержание 1734
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Страница 6: ...vi Point IO 2 Channel Isolated Output Analog HART Module User s Manual Pub 0300272 03 Rev B ...
Страница 10: ...1 4 Chapter 1 Module Overview User s Manual Pub 0300272 03 Rev B ...
Страница 13: ...Chapter 1 Module Overview 1 7 User s Manual Pub 0300272 03 Rev B See the block diagram below ...
Страница 14: ...1 8 Chapter 1 Module Overview User s Manual Pub 0300272 03 Rev B ...
Страница 24: ...2 10 Chapter 2 Installation and Wiring User s Manual Pub 0300272 03 Rev B ...
Страница 36: ...3 12 Chapter 3 Configuring the Module User s Manual Pub 0300272 03 Rev B ...
Страница 68: ...4 32 Chapter 4 OE2CIH and HART User s Manual Pub 0300272 03 Rev B ...
Страница 74: ...A 6 Appendix A Module Specifications User s Manual Pub 0300272 03 Rev B ...
Страница 76: ...I 2 Index User s Manual Pub 0300272 03 Rev B ...
Страница 77: ...User s Manual Pub 0300272 03 Rev B ...