Passive split: (No latency, no re-transmitting packets…. Receive Only, can’t tell which device is sending)

https://www.compuphase.com/electronics/rs232split.htm

.. Use 2 splits, into 2 MAX232s into 2 Serial RX on Teensy.

Serial In (From Control System)

MAX232 -> TTL Serial #1

Microcontroller (Teensy?)  Echos incoming strings to output, and onto – USB for Monitoring & Manual commands on local laptop running Putty etc.

TTL Serial #2 -> MAX232

Serial Out (To Device under test – ie Projector)

• USB control includes prompt to change baud rate. Settings stored to EEPROM.
• Phoenix to Screw terminals TX/RX/GND
• Phoenix to DB9 connector adapter.
• Phoenix to RJ45 adapter
• jumpers to bypass TX / RX
• LEDs to indicate traffic on bus.

Optional

• Ethernet to remotely log
• SD Card slot to log inc Real Time Clock.
• LCD / OLED for local monitoring