diff options
Diffstat (limited to 'serial/serialposix.py')
| -rw-r--r-- | serial/serialposix.py | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/serial/serialposix.py b/serial/serialposix.py index bc2468c..0bf3df5 100644 --- a/serial/serialposix.py +++ b/serial/serialposix.py @@ -139,8 +139,10 @@ if plat[:5] == 'linux': # Linux (confirmed) # noqa buf[0] |= SER_RS485_RTS_AFTER_SEND else: buf[0] &= ~SER_RS485_RTS_AFTER_SEND - buf[1] = int(rs485_settings.delay_before_tx * 1000) - buf[2] = int(rs485_settings.delay_before_rx * 1000) + if rs485_settings.delay_before_tx is not None: + buf[1] = int(rs485_settings.delay_before_tx * 1000) + if rs485_settings.delay_before_rx is not None: + buf[2] = int(rs485_settings.delay_before_rx * 1000) else: buf[0] = 0 # clear SER_RS485_ENABLED fcntl.ioctl(self.fd, TIOCSRS485, buf) |