odbus
— control slave modules on a PLC board¶
This module provides methods to list, read and write OD slave devices connected via I2C bus
class ODBUS¶
The ODBUS class provides a wrapper to I2C bus
Usage example:
import odbus
bus = odbus.ODBUS()
odbus.list()
bus.write(odbus.RELAY,odbus.CH1,1) # Switch the relay on
Constructors¶
- class odbus.ODBUS¶
Construct an ODBUS object. The I2C bus is hard-coded. No additional parameters are required.
Query devices¶
- ODBUS.list()¶
Query all devices currently on the bus.
- ODBUS.read(device, address)¶
Read the value, currently stored in the address location of the EEPROM of the device with the address device. Predefined locations are:
ID - the device ID
ADDR - the device address (i.e. device)
RST - restart the device
CH1 - channel 1 (if present)
CH2 - channel 2 (if present)
ALRM - alarm condition
Predefined device IDs:
RELAY
- 0x08IO
- 0x09
- ODBUS.write(device, address, value)¶
Write a value (must be an integer in the range of [0:255]) to the address location of the EEPROM of the device with the address device.