Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Improve startup sequence to be compliant with the spec #20

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Improve startup sequence to be compliant with the spec #20

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
26 changes: 12 additions & 14 deletions iec62056_21/client.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -59,11 +59,10 @@ def __init__(
self.manufacturer_id = None
self.use_short_reaction_time = False
self.error_parser = error_parser_class()
self._current_baudrate: int = 300

if self.transport.TRANSPORT_REQUIRES_ADDRESS and not self.device_address:
raise exceptions.Iec6205621ClientError(
f"The transported used ({self.transport}) requires a device address "
f"The transport used ({self.transport}) requires a device address "
f"and none was supplied."
)

Expand Down Expand Up @@ -146,11 +145,14 @@ def startup(self):
"""
Initial communication to start the session with the device. Sends a
RequestMessage and receives identification message.

The request message and its response are transmitted at a rate of 300 baud.
"""

self.transport.switch_baudrate(300)
if self.battery_powered:
self.send_battery_power_startup_sequence()
logger.info("Staring init sequence")
logger.info("Starting init sequence")
self.send_init_request()

ident_msg = self.read_identification()
Expand Down Expand Up @@ -270,24 +272,20 @@ def send_battery_power_startup_sequence(self, fast=False):

Normal:
Null chars should be sent to the device for 2.1-2.3 seconds with a maximum
of 0,5 seconds between them.
After the last charachter the client shall wait 1.5-1,7 seconds until it
sends the request message
of 0.5 milliseconds between them.
After the last charachter the client shall wait 1.5-1.7 seconds until it
sends the request message.
Transmission speed for the start procedure is 300 baud.
Each NUL char consists of 10 bits: 1 start, 7 data, 1 parity, 1 stop

:param fast:
"""
if fast:
raise NotImplemented("Fast startup sequence is not yet implemented")

timeout = 2.2
duration = 0
start_time = time.time()
logger.info("Sending battery startup sequence")
while duration < timeout:
out = b"\x00"
self.transport.send(out)
self.rest(0.2)
duration = time.time() - start_time
out = b"\x00" * 66 # 2.2 s / (10 bits/char / 300 bits/second) = 66 char
self.transport.send(out)
logger.info("Startup Sequence finished")

self.rest(1.5)
Expand Down