– 4 –
4-3: RS-232C
RS-232C provides two types of command system. (To support the command system
of previous models.)
One adds “CR” (0DH) and “LF” (0AH) to the ASCII code, and the other adds the
control code “SOH” (01H) and “ETB” (17H).
(When you develop new software, the CR/LF command system is recommended.)
ASCII command
CR
LF
STX
ASCII command
LF
When the command is issued to PRECA 1280i:
If the command is established, “ACK” (06H) is displayed.
If the command is executed correctly, “NAK” (15H) is displayed.
In development programs, when the letter code is not received correctly, you can
change the display to ASCII letter string of OK CR/LF, NG CR/LF by issuing the
“s_RSOK” command. Once the “s_RSOK” command is issued, from then on, the
display mode is set to the OK or NG mode.
When you turn on the power to this unit, the ACK or NAK reply mode is always
selected.
