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described in Table 5.2). For example, the message "r3h873 EXC.2 ILLEGAL DATA ADDRESS" means that for
device 3 register with address 873 is not readable (or absent).
Table 5.2 – The standard Modbus exception codes
Code
Exception
1
ILLEGAL FUNCTION
2
ILLEGAL DATA ADDRESS
3
ILLEGAL DATA VALUE
4
DEVICE FAILURE
5
ACKNOWLEDGE
6
DEVICE BUSY
8
MEMORY PARITY ERROR
GATEWAY PATHS NOT
10
AVAILABLE
TARGET DEVICE FAILED TO
11
RESPOND TO GATEWAY
5.2.2.5. Data collection and event tracking
When action logic program is loaded into the internal memory, the device reads the specified registers
(connected devices or EM-481) at a specified interval, then performs the specified conversions and evaluates the
received data. As a result, the following actions can be performed: SMS sending, writing to the specified register
(connected device or EM-481). The program is loaded into the internal memory from the memory card. The
procedure for preparing and downloading the program into the device is described in Appendix C.
5.3. Configuration
5.3.1. General
The connection settings of EM-481 is made via HTTP protocol or via Modbus TCP protocol and serves for
specifying the main parameters needed for the device operation: types of connected sensors, exchange parameters
via RS-485, parameters of address in Ethernet network (if Ethernet is used) and server address to which EM-481 is
connected automatically.
The adjustable parameters are described in items 5.3.2. The parameters remain saved after the power cut off.
EM-481 setting can be made by two methods:
Via WEB-interface (it. 5.3.3);
Via Modbus-interface (it. 5.3.4).
ATTENTION! WHEN CHANGING EM-481PARAMETERS, THE VALUES MAY BE SET THAT INTERFERE OR
BLOCK THE CONNECTIONS TO IT IN THE NETWORKS. IN THIS CASE, THE PARAMETERS SHOULD BE
RESETTED TO THE FACTORY VALUES.
Safely remove of the memory card, restarting the device or reset of settings to factory values is executed by
means of the "R" button available through a hole on a front panel. The button is pressed by a thin subject.
The reset of the device to factory settings:
– press and hold the reset button "R" for not less than 8 seconds (after 2 seconds of holding the indicator
"AL" will light on); after 8 seconds of holding the device will restart, the indicators will blink one time;
– then release the button "R".
To restart the device with saving of the user's settings:
– press and hold the reset button "R" during time from 2 to 8 seconds;
– when "AL" indicator lights on, release the button "R".
To display information about connections or safely remove of the memory card:
– press and release the reset button "R", the display shows information about connections, the indicator
"Memory SD" will go out. Remove the memory card, if necessary.
5.3.2. EM-481 parameters
The sets of parameters available via MODBUS protocol are provided in Table 5.3. The internal structure of all
sets of parameters is similar to the structure of a set provided in Table 5.8, for exception of the initial address.
The format of parameters presentation in MODBUS registers is described in Table 5.4.
Parameters describing the device are given in Table 5.5.
The parameters of the device current mode are available for reading and writing and are provided in Table 5.6.
The parameters of current state are available only for reading and are described in Table 5.7.
The setting parameters are available only in the setting mode and are listed in Table 5.8.
Table 5.3 – The sets of parameters available via Modbus protocol
Set
EM-481
10
-
-
The received function code cannot be processed
The data address specified in the query is not available
The value contained in the query data field is invalid value
Unrecoverable error has occurred when the addressee has tried to
perform the requested action
The addressee accepted the request and processed it, but it takes a long time
The addressee is busy processing the command. The client can retry the
message later
The parity error was detected when the addressee has tried to read the
extended memory
The gateway cannot redirect the query, since there is no path (connection)
to the addressee
The gateway did not receive a response to the forwarded query, because
the addressee did not respond on time
Description
Description
Access
NOVATEK-ELECTRO
Address
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