Telex: Teletype expanders

[rennerom]

EDIT: See you’ve found what you need. I’ll leave this up for reference sake though.

I sometimes come back to this thread If ground is the white stripe, then the next pin should be slotted for SCL and the last pin should be slotted for SDA.

@bpcmusic

In many respects, the TXb is order neutral. All pins in the same row are connected together. The pins with the white box around them are ground. The other two have pull-up applied (when powered).

That said, there is a standard ordering based on how the Teletype, Ansible, trilogy modules, TELEX modules, and Mannequins modules (Just Friends and W/) have things set up. Ground may be oriented differently depending on the module, but the order is the same.

• SDA
• SCL
• GND

The early ER-301 do not follow this ordering and swap the SCL and SDA lines.

You will find more info here in this lovely guide:

A user’s guide to i2c modules/devices Prepared by @okyeron, @scanner_darkly and @justmat A growing number of devices are making use of the i2c protocol, so here’s a simplified users guide to help monome/modular/music people navigate this sometimes confusing space. Please add questions and comments and we can try to update the main post as needed. what is i2c? i2c is a communication protocol - it’s a way for devices to talk to each other, like MIDI or USB. Some wikipedia for reference: i2c …

[disquiet]

Thanks for that! Much appreciated. Search was not assisting my pandemic-melted brain.

[rennerom]

haha, I get that. I feel like any search for 3 letter acronyms/abbreviations like (txb i2c sca scl) is bound to be difficult. I recently re-wired a lot of my i2c set up so this was all fresh in my brain!

[disquiet]

@rennerom

I recently re-wired a lot of my i2c set up so this was all fresh in my brain!

I may pick your brain if mine continues to fail.

[zx81]

Is it possible to save the offset calibration data for txo so that it persists between resets?