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second. The available values are standardised. Using higher baud rate over longer lines may
introduce errors in transferred data. The default instrument RS-485 baud rate is 9600 bps.
#set_modbus_baud_rate=9600
#set_modbus_baud_rate=38400
#set_modbus_baud_rate=57600
#set_modbus_baud_rate=115200
#set_modbus_baud_rate=1200
#set_modbus_baud_rate=19200
Modbus ID:
Configures the device (slave) ID to be used for Modbus RTU protocol. Modbus RTU uses
request/response format and allows multiple instruments to be connected on the same bus.
When a remote master transmits the request message, it will use the device ID as a device
address. All instruments will receive the request, but only the instrument with matching
device ID will answer to the received request.
Modbus parity:
Parity is used in serial communication for basic error detection. When parity is set
to none, no parity is used, and no error detection is possible on bit level. When parity is set
to odd parity, an additional bit is added to the communication that will be set to 1 when
there is odd number of bits with value 1 in the 8-bit payload byte. Similarly, when parity is
set to even parity, an additional bit is added to the communication that will be set to 1 when
there is even number of bits with value 1 in the 8-bit payload byte. In general, all bytes on
the receiver side where the parity bit is not matching the message will be discarded. Default
setting on most devices that use Modbus is even parity.
#set_modbus_parity=0 (none)
#set_modbus_parity=1 (odd parity)
#set_modbus_parity=2 (even parity)
Modbus stop bits:
Stop bits are added to the end of each data byte transferred over serial
communication, to allow pause between two bytes. One or two bits may be used. The
default setting on most Modbus RTU devices is one stop bit, but some dataloggers may
require that the instrument is configured to use two stop bits.
#set_modbus_stopbits=1
#set_modbus_stopbits=2
SDI-12 ID:
The SDI-12 device ID to be used on SDI-12 interface. In SDI-12 request/response protocol,
this ID will be used to define the instrument address, and the instrument will respond only
to requests with matching ID
#set_sdi_id=<0-61>
4-20 mA min:
To configure the 4-20 mA output range, the minimum measured value which will
correspond to 4 mA analog output needs to be set. The value is set in the currently
configured measurement unit.
Example:
if values measured by the instrument are expected to be within the range of
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