Contec IPC Series User Manual page 83

6. Appendix
Table 6.3. Function of Each Register < 4 / 4 >
I/O address
03FEH
MSR : Modem Status Register
D7
DCD
03FFH
SCR : Scratchpad Register
This is an 8-bit, readable/writable register which is available to the user to
allow data to be saved temporarily.
76
D6 D5 D4 D3
RI DSR CTS
DDCD TERI DDSR DCTS
CTS
DSR
RI
DCD
Description
D2 D1 D0
Delta CTS
Delta DSR
Trailing edge RI
Delta data carrier detect
PT-956SxX Series User's manual