L 1 4: SC.CV I TI.PARAM I
…is what you are looking for. (The TXi indexes at 1 just like the Teletype.) I’ve set pretty high rates for M in the past and have had no problems.
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I’ve also coded a master mode for the 16n that I’m planning to port over to the TXi at some point. If you load the “master mode firmware”, the TXi sends output to the ER-301, Ansible, and TXo (simultaneously) without requiring the Teletype in the middle.
Apologies if I’ve shared this before; here is a 16n prototype running in master mode controlling the ER-301 primarily, but you can see the CV lights on the TXo and Ansible reacting in the background as well.