Modbus-Tcp Protocol; Commands; Read Holding Registers - 0X03; Write Holding Registers - 0X06 - Novus LogBox Wi-Fi Instruction Manual

8. MODBUS-TCP PROTOCOL

The LogBox Wi-Fi is compatible with the Modbus-TCP protocol, a data communication protocol used to connect the device to supervisory control
and data acquisition (SCADA). It supports up to 5 simultaneous connections and allows up to 5 Modbus-TCP masters to monitor it at the same
time.
In addition to enabling the LogBox Wi-Fi monitoring, if enabled in the configuration, it is possible to configure some parameters described in Table
9. It is also possible to complete the configuration and logs download of LogBox Wi-Fi through the TCP/IP network. In order to do this, however, it
is necessary to use the NXperience configurator software (see the
8.1

COMMANDS

It is important to note that the "Slave ID" parameter of the Modbus-TCP protocol can be filled with any value between 0 and 255. LogBox Wi-Fi is
not a gateway, so it is only necessary to enter the IP address to perform the communication.
8.1.1 READ HOLDING REGISTERS – 0X03
This command can be used to read the value of one or even the maximum number of consecutive registers, as shown in Table 08.
8.1.2 WRITE HOLDING REGISTERS – 0X06
This command can be used to write in a register, as shown in Table 09.
8.1.3 WRITE MULTIPLE HOLDING REGISTERS – 0X16
This command can be used to write in a multiples registers, as shown in Table 09.
8.2

REGISTERS TABLE

Following is the table of registers supported by the device for the READ HOLDING REGISTERS commands:
ADDRES MNEMONIC
0 SERIAL_NUMBER_H
1 SERIAL_NUMBER_L
2 PRODUCT_CODE
3 FIRMWARE_VERSION
5 MAC_ADDR_WiFi_0_1
6 MAC_ADDR_WiFi_2_3
7 MAC_ADDR_WiFi_4_5
15 POWER_SUPPLY
21 USB_STATUS
32 NUMBER_OF_ACTIVE_CHANNELS
34 RECORDS_STARTED_INTERFACE
35 RECORDS_STOPPED_INTERFACE
36 STATUS_OF_RECORDS
37 NUMBER_OF_RECORDS_H
38 NUMBER_OF_RECORDS_L
39 NUMBER_OF_FREE_RECORDS_H
40 NUMBER_OF_FREE_RECORDS_L
43 FIRST_YEAR
NOVUS AUTOMATION
Configuration Software chapter for more information).
DESCRIPTION
Device serial number (High part).
Device serial number (Low part).
Device code.
Firmware version.
MAC Address Wi-Fi.
MAC Address Wi-Fi.
MAC Address Wi-Fi.
Power supply.
USB Interface status.
Number of active channels.
Indicates the interface responsible for initiating
logs.
Indicates the interface responsible for
stopping the logs.
Status of records.
Number of records in memory (High part).
Number of records in memory (Low part).
Number of records available in memory (High
part).
Number of records available in memory (Low
part).
Year of first log.
INFORMATION
Unit with two decimal places.
(XX:XX:00:00:00:00)
(00:00:XX:XX:00:00)
(00:00:00:00:XX:XX)
1. Battery;
2. USB;
3. External source.
1. Active USB voltage;
2. Inactive USB voltage;
3. COM port closed;
4. COM port open.
1. Immediately start;
2. Start by date/time;
3. Start by keyboard;
4. Start by digital input;
5. Periodical start (Diary);
6. Start by software.
1.
2. Finish by date/time;
3. Finish by keyboard;
4. Finish by digital input;
5. Periodical finish (Diary);
6. Finish by software.
1. Stopped logs;
2. Logging.
24/53