Printronix P7000 Cartridge Ribbon Printer - Manual (Page 99)

Serial Submenu
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The response characters are described in Table 4.
• SERIES1 2 CHAR . This protocol behaves exactly the same as the
Series1 Char except there is a two-character response to the host. The
response characters are described in Table 5.
• ENQ/ACK . Enquiry/Acknowledge. The host controls the flow of data by
sending an ENQ (Enquiry, decimal 5, Control-E) approximately every 80
characters. When the printer is ready for more data, it replies with an ACK
(Acknowledge, decimal 6, Control-F).
• DTR . The printer controls the data flow by sending this hardware signal to
the host. If there is enough room in the printer buffer, the printer will send
a high signal; if the buffer is full, the printer will send a low signal. DTR
tells the host if it is safe to send more data. (If the host sends data during
an unsafe condition, data will be lost.) DTR is not available when RS-422
is selected.
Table 4. Series1 1 Char Response Characters
Printer State Response
Online and Buffer Empty CR
Online and Buffer Full 3
Offline and Buffer Empty 0
Offline and Buffer Full 2
Table 5. Series1 2 Char Response Characters
Printer State Response
Online and Buffer Empty 1 CR
Online and Buffer Full 3 CR
Offline and Buffer Empty 0 CR
Offline and Buffer Full 2 CR