watlow
Python driver and command-line tool for Watlow EZ-Zone temperature controllers.
Installation
pip install watlow
Usage
Command Line
$ watlow /dev/ttyUSB0
This returns a simple data structure.
{
"actual": 21.66,
"setpoint": 20.0,
"output": 52.1
}
You can additionally use the --set-setpoint option to set a temperature setpoint.
If interacting with a Watlow RUI Gateway, the zone to get or set should be passed as a flag
$ watlow -z 1 192.168.1.101
See watlow --help for more.
Python
Single Controller
For a single temperature controller, the python interface is basic synchronous serial communication.
import watlow
tc = watlow.TemperatureController('/dev/ttyUSB0')
tc.set(30)
print(tc.get())
The driver is designed to be fault tolerant over long polling, and should
appropriately reconnect if its IOErrors are managed. Here's an implementation
with standard long-poll exception handling. This should run until interrupted and
then exit cleanly.
from time import sleep
import watlow
tc = watlow.TemperatureController('/dev/ttyUSB0')
try:
while True:
try:
print(tc.get())
except IOError:
print('disconnected')
sleep(1)
except KeyboardInterrupt:
pass
finally:
tc.close()
Gateway
The Gateway driver uses Python ≥3.7's async/await syntax to asynchronously communicate with the gateway over ModBus-TCP.
import asyncio
import watlow
async def run():
async with watlow.Gateway('192.168.1.101') as gateway:
print(await gateway.get(1))
asyncio.run(run())
Additionally, there is a mock for the Gateway driver available at watlow.mock.Gateway for testing.
4 maintainers
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