/usr/share/pyshared/pymodbus/constants.py is in python-pymodbus 0.9.0+r175-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Constants For Modbus Server/Client
----------------------------------
This is the single location for storing default
values for the servers and clients.
'''
from pymodbus.interfaces import Singleton
class Defaults(Singleton):
''' A collection of modbus default values
.. attribute:: Port
The default modbus tcp server port (502)
.. attribute:: Retries
The default number of times a client should retry the given
request before failing (3)
.. attribute:: Timeout
The default amount of time a client should wait for a request
to be processed (3 seconds)
.. attribute:: Reconnects
The default number of times a client should attempt to reconnect
before deciding the server is down (0)
.. attribute:: TransactionId
The starting transaction identifier number (0)
.. attribute:: ProtocolId
The modbus protocol id. Currently this is set to 0 in all
but proprietary implementations.
.. attribute:: UnitId
The modbus slave addrss. Currently this is set to 0x00 which
means this request should be broadcast to all the slave devices
(really means that all the devices should respons).
.. attribute:: Baudrate
The speed at which the data is transmitted over the serial line.
This defaults to 19200.
.. attribute:: Parity
The type of checksum to use to verify data integrity. This can be
on of the following::
- (E)ven - 1 0 1 0 | P(0)
- (O)dd - 1 0 1 0 | P(1)
- (N)one - 1 0 1 0 | no parity
This defaults to (N)one.
.. attribute:: Bytesize
The number of bits in a byte of serial data. This can be one of
5, 6, 7, or 8. This defaults to 8.
.. attribute:: Stopbits
The number of bits sent after each character in a message to
indicate the end of the byte. This defaults to 1.
'''
Port = 502
Retries = 3
Timeout = 3
Reconnects = 0
TransactionId = 0
ProtocolId = 0
UnitId = 0x00
Baudrate = 19200
Parity = 'N'
Bytesize = 8
Stopbits = 1
class ModbusStatus(Singleton):
'''
These represent various status codes in the modbus
protocol.
.. attribute:: Waiting
This indicates that a modbus device is currently
waiting for a given request to finish some running task.
.. attribute:: Ready
This indicates that a modbus device is currently
free to perform the next request task.
.. attribute:: On
This indicates that the given modbus entity is on
.. attribute:: Off
This indicates that the given modbus entity is off
.. attribute:: SlaveOn
This indicates that the given modbus slave is running
.. attribute:: SlaveOff
This indicates that the given modbus slave is not running
'''
Waiting = 0xffff
Ready = 0x0000
On = 0xff00
Off = 0x0000
SlaveOn = 0xff
SlaveOff = 0x00
class Endian(Singleton):
''' An enumeration representing the various byte endianess.
.. attribute:: Big
This indicates that the bytes are in little endian format
.. attribute:: Little
This indicates that the bytes are in big endian format
.. note:: I am simply borrowing the format strings from the
python struct module for my convenience.
'''
Big = '>'
Little = '<'
class ModbusPlusOperation(Singleton):
''' Represents the type of modbus plus request
.. attribute:: GetStatistics
Operation requesting that the current modbus plus statistics
be returned in the response.
.. attribute:: ClearStatistics
Operation requesting that the current modbus plus statistics
be cleared and not returned in the response.
'''
GetStatistics = 0x0003
ClearStatistics = 0x0004
class DeviceInformation(Singleton):
''' Represents what type of device information to read
.. attribute:: Basic
This is the basic (required) device information to be returned.
This includes VendorName, ProductCode, and MajorMinorRevision
code.
.. attribute:: Regular
In addition to basic data objects, the device provides additional
and optinoal identification and description data objects. All of
the objects of this category are defined in the standard but their
implementation is optional.
.. attribute:: Extended
In addition to regular data objects, the device provides additional
and optional identification and description private data about the
physical device itself. All of these data are device dependent.
.. attribute:: Specific
Request to return a single data object.
'''
Basic = 0x01
Regular = 0x02
Extended = 0x03
Specific = 0x04
class MoreData(Singleton):
''' Represents the more follows condition
.. attribute:: Nothing
This indiates that no more objects are going to be returned.
.. attribute:: KeepReading
This indicates that there are more objects to be returned.
'''
Nothing = 0x00
KeepReading = 0xFF
#---------------------------------------------------------------------------#
# Exported Identifiers
#---------------------------------------------------------------------------#
__all__ = [
"Defaults", "ModbusStatus", "Endian",
"ModbusPlusOperation",
"DeviceInformation", "MoreData",
]
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