BIC-II SUPPORT
As preset, the DPL+ provides a digital output via the
Peripheral Communications
( 20 mA bipolar serial
current loop) terminals, capable of supporting the Milltronics BIC-II.
The DPL+ utilizes
simplex convention
communication protocol. Data messages 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
Field Name Definition
Start Of Message STX ($02)
Message Type 2 characters, 00 (indicates the following data pertains to a scan point measurement)
Point # 3 characters, 001 to 003 (e.g. the message pertains to Point Number 1)
Reading 5 characters, 0.000 to 9999. (e.g. reading = 678.9, DDDD. = no data, EEEE. = overflow)
Status A 1 character, $0 to $F (convert to binary, e.g. temp, echo, and cable OK, not priority)
MSB LSB
####
1 = temp alarm
1 = loss of echo (f.s. expired)
1 = transducer cable fault
1 = priority point
Status B 1 character, $0 to $F (convert to binary, e.g. scan point is in high alarm)
MSB LSB
####
1 = low low alarm
1 = low alarm
1 = high alarm
1 = high high alarm
Status C 1 character, $0 to $F (convert to binary, e.g. scan point is not in rate or band alarm)
MSB LSB
####
1 = rate alarm 2
1 = rate alarm 1
1 = band alarm 1
1 = band alarm 2
Temp 2 characters, $32 to $FA (convert to decimal and subtract 100, e.g. temperature = 20 °C)
Percent 5 characters, 00.00 to 9999. (e.g. current level = 85.00% of span, EEEE. = field overflow)
End Of Message CR ($0D)
Message Type
Start of Message
Point #
Reading
Status
A
Status
B
Status
C
Temperature
Percent
End of Message
e. g.
TECHNICAL REFERENCE
PL-508 93
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