DECODE EMU-C3 Benutzerhandbuch - Seite 8

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EMU - User manual v1.2

Functionality

After powering the unit, device read parameters from non-volatile memory, enter NORMAL

operation mode, perform periodic measurements and wait for communication. In this mode,

the LED ON will flash in two-seconds cycle. LED indications, red for TX and green for RX, signal

the sending and receiving of data along the RS-485 line. Wrong polarity of RS-485 line is

indicated by constantly lit RX. Factory default parameters are modbus address 1, serial speed

9600 bits per second and format 8 bit with "no parity".

The SETUP mode is used to perform modification of internal parameters stored in non-

volatile memory. Values from non-volatile memory are used to initialize registers 40008 to

40016 after power on. This mode is entered by holding the SET button while powering on the

device. Unit switches on and after a while LED ON starts to flash in one-second cycle. Then the

button can be released.

In SETUP mode, the serial speed, format and modbus address are automatically adjusted to

9600 bps, "no parity" and 1, regardless of the preset from non-volatile memory.

To modify values in registers 40008 to 40017, the modbus function 06 - Preset single register

is used. Registers 40001 to 40007 are read only. Parameters like modbus address, serial

speed and format settings are set in registers 40014, 40015 and 40016. Registers 40008 to

40013 should not be adjusted because they hold calibration parameters and are already set

in production.

Storing the values from registers 40008 to 40016 to nonvolatile memory is issued with special

command by preset the value 11111 in register 40017. Register 40017 automatically returns

the value to 0 after execution command.

Exiting the SETUP mode is only possible by powering the unit off and on without holding the

SET button.

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Functionality

EMU_UM_V12_05042020.pdf