Data bits
- not selectable.
Parity
- set the type of parity control in data format.
Stop Bits
- set the number of stop bits in data format.
Timeout
- set the timeout in ms.
MODBUS function
- set the function for MODBUS-RTU protocol, for communication with ADA-401WP module.
6.3.2. MODULE MONITORING- MODBUS-RTU
MODBUS Monitoring
has options for MODBUS-RTU communication:
Monitoring bottom
Pressing this button will cause readout of:
a) configuration parameters of measurement channels like: Sensor S/N, Location, Val. Lo, Val. Hi, Offset, Enable, Assigned,
b) channel diagnostics like: measurement value, status of measurement channel (U.m., V<VL, V>VH, Enable, Assigned, Busy,
Deleted, CRC).
Pressing the button
Monitoring
again, interrupt the monitoring.
MODBUS communication Log
This section is additional element of diagnostic MODBUS-RTU protocol, where frames of inquiry and respond come out during
measurement monitoring and status of measurement channels are being written.
Table
MODBUS Monitoring
has columns
:
Channel
- the number of measuring channel.
Sensor SN
- serial number of detected sensor.
Location
- place of sensor's installation.
Val. Lo
- low limit of measuring value. If the value measured by sensor will be lower, that will be setted the byte of exceed
lower threshold
V<VL
in the register of measurement channel.
Val. Hi
- upper limit of measuring value. If the value measured by sensor will be higher, that will be setted the byte of
exceed upper threshold
V>VL
in the register of measurement channel.
Offset
- value by which will be increased or decreased measured value of measurement for the linear calibration of the
measurement. Offset value depends on sensor type and is:
- from – 1.27°C to +1.27°C for digital temperature sensors: DTS-RJ45, DTS-103, DTS-107, DES-216,
DES-300-T, DES-300E-T etc.,
- from -12.70%Hig to +12.70%Hig for digital relative humidity sensors: DES-216-H, DES-300-H etc.,
- from -12.70hPa to +12.70hPa for digital atmospheric pressure sensors: DES-216-AP, DES-300-AP etc.
Enable
- activation this field will cues actualisation of measurement and status for channel, deactivation will cues block
actualisation.
Assigned
- activation this field will cues adding a sensor to the Channel. Deactivation will cues that in case of next sensors
searching by the module in field [Sensor SN] channel can be serial number or other sensor.
Progress
- horizontal indicator of measuring progression.
Value
-
measurement value readout from the sensor.
U.m.
-
unit of measurement, measured by the sensor.
V<VL
- indicates that the value readout from the sensor is short then the lower limit of the value
VL
.
V=>VH
- indicates that the value readout from the sensor is equal to the lower limit of the value
VH
Enable
- indicates that the measuring channel is unblocked and measuring data and the channel condition are being
updating systematically.
Assigned
- indicates that sensor of serial number was assigned to measuring channel.
Busy
- indicates that sensor is processing data.
Detected
- indicates that the sensor of serial number from field
Sensor SN
was detected.
CRC
- indicates error of CRC sensor memory or connection error.
Readout of MODBUS registers for columns:
Sensor SN, Location, Val. Lo, Val. Hi, Offset, Enable, Assigned – is available from
2,005 version of firmware and from 1.7.1.0 version of ADAUtil software.
In this table the status of measuring channel are shown by use the colours as follows:
Field
[Value]
Red – alarm status of channel, exceed thresholds VH.
Blue - alarm status of channel, exceed thresholds VL.
Green – standard status of measuring channel.
Field
[V<VL], [V>VH], [Enable], [Assigned], [Busy], [Detected], [CRC]
Yellow – alarm status of field in measuring channel
White – standard status of field in measuring channel
7. IMPLEMENTATION OF MODBUS-RTU PROTOCOL
ADA-401WP module is a like node for the 1-wire network. Each node can be addressed and connected to RS485 bus, and this allow
working together many dispersed 1-WIRE networks, with remote control system e.g. temperature, humidity, atmospheric pressure CO
2
concentration, etc. RS485 bus can be extended on lengths of 1200m, by using the ADA-4040 repeater or ADA-4044H RS485 HUB.
The MODBUS-RTU protocol used for communication between ADA-401WP modules and SCADA type system or PLC controller
20
ADA-401WP
