2.3 COM Enumerator Recognition by Serial Mice

2.3 COM Enumerator Recognition by Serial Mice

This is a sample implementation. This design requires the mouse to treat the RTS lead as a reset lead, with mouse operation enabled by RTS=1.

Echo DTR to DSR, always, in hardware. On Power-up (from DTR=1 and TXD=Mark)
If RTS=0, wait (forever) for RTS=1
If RTS=1, go send COM ID (e.g. Table 3)
Go be a mouse
If RTS=0, go back to state (c).