TxMini-M12-485 Transmitter
NOVUS AUTOMATION
3/5
Procedure for Temporary mode
:
1º
Disconnect the cable from the device (M12 connector).
Fig. 2
- Open the M12 connection
2º
When reconnecting the power and communication cable (M12),
the transmitter will temporarily return to the default communication
parameter values for Baud Rate (1200), Parity (Even) and Address
(247). At this time, the default value of the
Duration
parameter (60
s) will ensure that the device remains with the default parameters
mentioned during this period, i.e., the user will have this time to
perform the procedures below (
3 to 7
) before the device returns to
the communication settings previously recorded in its memory:
Baud Rate: 115200, Address
:
121 and Parity: None.
Note
: If the user does not perform the steps (
3 to 7
) before the
time set in the Duration parameter, the device returns to the
previously set parameters.
3º
Run
DigiConfig
software.
4º
Click in the menu
Configurations
Communication
.
5º
Make sure that you configure the
DigiConfig
communication
parameters with default values for the requested device, according
to
Table 1
.
6º
In
Search Options
field, select the
Temporary
condition.
7º
Click on the Search button:
8º
The device
will appear in the Devices field classified as
Temporary.
9º
Click on the temporary device on the tree.
10º
Will be shown the equipment with the address
247
, title, serial
number of the transmitter (S/N) and the firmware version of
TxMini-M12-485
.
Now you can check the previous configuration values for baud rate
(
115200
), parity (
none
) and address (
121
) of the device on the
Device Configuration field.
DIAGNOSTIC
Temperature: On the Diagnostics tab, it shows the read
temperature value and its corresponding unit.
Status: Close to the position of the temperature, there is the error
indicator. The error states are:
- Open Sensor: When we have no Pt100 sensor connected, the
status will indicate sensor break.
- Overflow: If the sensor is reading a temperature value above the
allowed measurements for Pt100 sensor, the status will indicate
overflow.
- Underflow: If the sensor is reading a temperature value below the
allowed measurements for Pt100 sensor, the status will indicate
underflow.
MODBUS COMMANDS
Table 4 lists the Modbus RTU commands (functions) that you can
use to supervise or configure the main parameters of the
transmitter. For further information with respect to each of these
commands and the Modbus protocol in general, please access the
site
www.modbus.org
.
READ HOLDING REGISTERS – 0 x 03
Use this command for reading the value of one or several holding
registers, according to the “Holding Registers Table”.
WRITE HOLDING REGISTERS – 0 x 06
Use this command for writing in a holding register, according to the
“Holding Registers Table”.
RETENTIVE REGISTERS
The specified addresses correspond to the low-level physical
addresses, where zero (0) corresponds to the address of PLC
40001.
The
minimum
and
maximum
values shows the range of valid
values for each parameter. The R/W column indicates whether the
parameter is read-write (
R/W
) or read-only (R).
Address
Description
Minimum Maximum R/W
0
Serial number (word high)
0
65535
R
1
Serial number (word low)
0
65535
R
2
Firmware release
100
199
R
3
Model
0
255
R
4
Input Reading - AD
-
-
R
5
Temperature Value
(ºC or ºF).*
-200
600
R
6
Status of error, overflow
underflow.
0
65535
R
7
Baud-Rate
0
7
R/W
8
Parity
0
2
R/W
9
Modbus Address
1
247
R/W
10
Temperature Unit
0
1
R/W
11
Error value
-9999
9999
R/W
12
Sensor
0
0
R
15
User offset for
temperature.*
-100
100
R/W
16
Title
-
-
R/W
17
Title
-
-
R/W
18
Title
-
-
R/W
19
Title
-
-
R/W
20
Title
-
-
R/W
21
Timer – Temporary Mode
10
90
R/W
22
Digital Filter
0
20
R/W
Table 4
-
Retentive Registers
*
For the table above, include one decimal digit. For ex.: -100
means -10.0.
DESCRIPTION OF SOME REGISTERS
REGISTER 7 – BAUD RATE
Defines the Modbus communication speed. The transmitter comes
factory-configured with a
Baud Rate
1200
.
Code
Baud Rate
0
1200
1
2400
2
4800
3
9600
4
19200
5
38400
6
57600
7
115200
Table 5
- Baud Rate
