So after the name calling and characterization, I guess it has finally gotten through that there was an error in the schematic given as above, as stated several times.
Also, apparently while busy calling me sarcastic, it was missed that I stated the small coil in the latching relay did not need a snubber diode for protecting the Crest unit. This can be seen by the small amount of current it draws (see the data sheet) and also the clear fact that the Crest unit ALREADY can drive switch motors with no further protection.
(post 32 is the complaint, post 36 indicates snubber not needed on relay coil)
So the Crest can be connected to the coil of the latching relay directly, and then whatever voltage needed for the pneumatic solenoid can be switched by only one set of contacts, and a snubber SHOULD be used across the coil of the pneumatic solenoid (they do indeed have quite an inductive kick, I know I use them)
The positive and negative pulses from the Crest will set and reset the latching relay, and then will energize or de-energize the pneumatic relay.
Max want it it simple.... one latching relay and diode per switch output. Cannot get simpler than that.
This schematic, with the revisions:
Clearly this is so simple (be sure to locate the diode as close to the solenoid as possible) Max should try it out... keep your eyes open Max, you will find more of the Crest units on the second-hand market. Get a couple of spares.
Greg