Mt-00 Measurement Message - Siemens sitrans LU01 Instruction Manual

26 through 32. The mode of communication is established by the configuration of the
connection made at the SITRANS LU01, either RS-232, RS-485 or bipolar current loop.
The SITRANS LU01 uses
are continuously transmitted at regular intervals (no poll is required) at 4800 baud. All
data is transmitted in structured messages of ASCII characters consisting of 8 data bits,
no parity, and 1 stop bit.
If Peripheral Communications (P740) is set for "formatted" messages, a comma is inserted
between each message field (except immediately preceding the "End of Message"
characters).

MT-00 Measurement Message

start of message
message type
Field Name
Start Of Message
Message Type
Point #
Reading
Status A
1 character, $0 to $F (convert to binary, e.g. temp, echo, and cable OK, not priority)
MSB LSB
# # # #
7ML19985BE02
simplex convention
point # status A
reading
STX ($02)
2 characters, 00 (indicates the following data pertains to a scan point mea-
surement)
3 characters, 001 to 003 (e.g. the message pertains to Point Number 1)
5 characters, 0.000 to 9999. (e.g. reading = 678.9, DDDD. = no data, EEEE. =
overflow)
1 = temp alarm
1 = loss of echo (failsafe expired)
1 = transducer cable fault
1 = priority point
SITRANS LU01 – INSTRUCTION MANUAL
communication protocol. Data messages
status C
status B temperature
Definition
percent
end of message
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