Crison MultiMeter 44 Manual Del Usuario página 66

Advanced operations
64
$: letter $. Value hexadecimal 24 (36 decimal)
<Instrument serial number>: 5 numeric ASCII digits corresponding to the instrument serial
number.
COMMUNICATION PROTOCOL
Common parts of all messages
STX, <Message>, LF, CR, ETX
Where
STX: Control character "Start text". Value hexadecimal 2.
<Message>, Characters chain ASCII. See measuring and calibration data.
LF: Control character "Line Feed". Value hexadecimal A (decimal value 10).
CR: Control character "Carriage Return". Value hexadecimal D (decimal value 13).
ETX: Control character "End of text". Value hexadecimal 3.
Measuring data
Depending on programmed in RS-485 communication "Configure Computer" the
instrument will send data in two ways:
1. Sending data to PC: Data Format single channel
a. Control character <STX>
b. Index, corresponding to the number of massages sent from every instrument. It
starts with the start up of every instrument and every instrument has its own index
of sent data.
c. Indicator of measured data, M.
d. Serial number and instrument name. If there is not an assigned name to the
instrument appears an empty space.
e. Date and hour.
Position of the cleaning, alarm and limits relays:
f.
Cleaning relay
Channel Alarm
Sensor Alarm
Limit 1
Limit 2
Note: The letter sent in case of relay connected depends on the language.
g. Number of the channel sending the measurement, C1, C2 or C3.
h. Type of measurement, pH, EC, DO, etc.
Value of the measurement.
i.
Measuring units.
j.
k. Value and units of the temperature.
Control characters <LF> <CR> <ETX>
l.
2. Sending data to PC2: Data Format all channels
a. Serial number.
b. Instrument name.
c. Date.
Connected Disconnected
R
A
AS
L1
L2
0
0
0
0
0