Burkert Type 8717 - Manual (Page 10)

10
Serial Communication
long frame address (5 bytes)
Bit 39
0: Secondary master
1: Primary master
Bit 38 0: Not in burst mode
1: In burst mode (not supported)
Bits 32 – 37 Manufacturer's Id code (0x78 = Buerkert),
Bit 37 = MSB, bit 32 = LSB
Bits 24 – 31 device type code (0xEE = Mass flow controller/meter),
Bit 31 = MSB, bit 24 = LSB
Bits 0 – 23 device Id number,
Bit 23 = MSB, bit 0 = LSB
(matches the device serial number)
Each field unit must respond to address 0 (bits 0 – 23 = 0).
Bit 37 Bit 23 Bit 0
| | |
mb x x x x x x x y y y y y y y y z z z z z z z z z z z z z z z z z z z z z z z z
z device Id number
y device type code
x Manufacturer's
Id code
b Burst info
m Master address
command
Commands are divided into the following categories in conformity with HART:
Universal commands Commands 0 – 30
Standard commands Commands 32 – 126
device-specific
command
Commands 128 – 253
(reserved: 31, 127, 254, 255)
Byte count
The byte count indicates how many more bytes come before the checksum, i.e. the number of status bytes +
number of data bytes. This results in a maximum total number of 255 status and data bytes.
response code
Transferred only from the slave to the master in a response telegram. Consists of 2 bytes. The status bytes are
used to detect communication errors or for the operating status of the slave device.
Data
data bytes, depending on the command. A maximum of 255 data bytes can be transferred.
• Float – IEEE 754 single precision (4 bytes) float
english
MFC Family