The following diagram shows the signal timing for the command LPRINT"X" with the CE-
126P connected:
The PC-G850V(S) is waiting for ACK going HIGH before BUSY is set to HIGH for each
clock pulse. This synchronous, serial protocol is also used by the CE-126P interface of
the PC-E500(S).!
SSIO-Mode:&LPRT-Protocol&and&Mini-I/O&Port&
!
The mini-I/O port of the PC-G850V(S) is just a logical grouping of the six main signals of
the SSIO-mode into two groups, three signals/bits each:
• Mini-I/O output-port (3-bit)
o XOUT (bit-0)
o DOUT (bit-1)
o BUSY (bit-2)
• Mini-I/O input-port (3-bit)
o ACK (bit-0)
o DIN (bit-1)
o XIN (bit-2)
The bits of the mini-I/O port can be controlled explicitly via the functions
OUT/miniput() and INP/miniget(), so that e.g. custom communication protocols
can be implemented on that basis.
Besides that, the PC-G850V(S) provides a synchronous, serial protocol for data transfer
to a respective peripheral device. In order to enable that, the 11-pin interface must be
opened with the command OPEN(“LPRT:“). The data-streams of the commands
LPRINT, LLIST and LFILES are then sent over this protocol using ASCII code.
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