Yes. Connect a ground wire from each Vss to the other Vss. Then connect a wire from one P0 to the other P0. Designate one BS2 as 'master', the other 'slave'.
The 'slave' spends most of its time in a 'SERIN 0, 16468, [noparse][[/noparse]DEC MyData]' statement, waiting for data from the 'master' BS2. When the 'master' is ready to communicate, it does a 'SEROUT 0, 16468, [noparse][[/noparse]DEC 1]'. The 'slave' is waiting for this, and then does a SEROUT of its data to the 'master', which should do a SERIN to recieve it.
PHM102
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The 'slave' spends most of its time in a 'SERIN 0, 16468, [noparse][[/noparse]DEC MyData]' statement, waiting for data from the 'master' BS2. When the 'master' is ready to communicate, it does a 'SEROUT 0, 16468, [noparse][[/noparse]DEC 1]'. The 'slave' is waiting for this, and then does a SEROUT of its data to the 'master', which should do a SERIN to recieve it.