Could probably reduce latency with an alternative read instruction

[teauxfu]

Currently using pySerial's read_until for convenience

https://github.com/teauxfu/py-hplc/blob/4df7179edf2abeed33d7223cd5fa2b7df646e40f/py_hplc/pump_base.py#L204

Which is defined as

https://github.com/pyserial/pyserial/blob/0e7634747568547b8a7f9fd0c48ed74f16af4b23/serial/serialutil.py#L654-L674

However, implementing a custom readline instruction may be able to reduce latency (which isn't currently an issue -- at least for my purposes)

pyserial/pyserial#216 (comment)