Printronix P7000 H-Series Cartridge Ribbon Printer - Manual (Page 70)

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Chapter 4 HOST INTERFACE
The response characters are described in Table 2.
• 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 3.
• ENQ / ACK . ENQ selects odd dot plot mode to print dots in odd
numbered dot columns for normal density plotting. It defines certain data
between the next and last paper motion commands as odd dot plot data.
ACK selects line spacing of 1/8” or 7/72” for current line only.
• 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 2. 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 3. 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