rsdio tipped us to some interesting parts and application notes: MAX13450E, MAX13451E RS-485 Transceivers with integrated termination Resistors
It’s my goal to some day finish a DMX512 dimmer board that I started, based on the PIC16F87 and as many LEDs as can be attached to its I/O pins – next task would be a DMX512 controller with lots of RS-485 outputs…
- Software/Pin-Selectable Termination Eliminates the Need for External Resistors and DIP Switches
- Supports Cat-5/Cat-6 and 24-AWG cables
- Integrated low-voltage logic interface (down to 1.62V) supports small-geometry ASICs and FPGAs
- Driver fault-indication output (MAX13451E)
- High ±30kV (HBM) ESD protection and automotive temperature range (-40°C to +125°C) ensures robustness
Thanks for the tip!