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User’s Guide
Interface Specifications
B-8
When the printer is ready for more data, it will transmit the DC1 (X-ON) character.
ETX/ACK: The host will include the ETX character at the end of a string of data.
When the printer detects the ETX character, it transmits an ACK
character to the host, indicating it is ready for more data.
ENQ/ACK: The host will include the ENQ character at the end of string of data.
When the printer detects the ENQ character, it transmits an ACK
character to the host, indicating it is ready for more data.
XON + ETX: Enables XON/XOFF and ETX/ACK
XON + ENQ: Enables XON/XOFF and ENQ/ACK
Serial port configuration can only be selected through the front panel. Only one
handshaking protocol can be selected at a time. The DTR protocol can be selected with
any handshaking protocol. If the user selects modem control, the printer will only receive
and transmit data if RTS, CTS and DSR are honored and provided by the host.
X-ON CTRL: Only when ‘Robust’ X-ON CTRL is selected, DC1 will be transmitted
every 4 seconds while the printer is idle and ready to accept data. Also,
if no data is being transmitted and the printer is printing, a DC1 will be
transmitted every 256 bytes as the FIFO goes empty.
X-OFF CTRL: Only when ‘Robust’ X-OFF CTRL is selected, DC3 will be transmitted
every time a character is received while the serial interface is not ready
to accept data.