# \#blxsxx

**URL:** https://forums.digi.com/tag/blxsxx/3679.md

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## [What might bias the analog inputs low in the BLxSxx series?](https://forums.digi.com/t/what-might-bias-the-analog-inputs-low-in-the-blxsxx-series/19308)

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**Author:** [@Jesse\_M](https://forums.digi.com/u/Jesse_M)\
**Replies:** 3\
**Last updated:** [March 21, 2018, 5:26pm UTC](https://forums.digi.com/t/what-might-bias-the-analog-inputs-low-in-the-blxsxx-series/19308 "2018-03-21T17:26:15Z")

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I’m updating a controller that previously used an SR9000 system to BL5S220 controllers. The analog-in channels consistently read low compared to a calibrated voltmeter. To make sure it wasn’t our program or equipment I…