IBM InfoPrint 6700 Series, Руководство пользователя

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Chapter 3
SERIAL PORT
One Char Enquiry
The One Char Enquiry mode uses the Poll Character to detect a request from
the host and sends a response back to the host. This option also allows you to
turn on and off this feature.
The Poll Character is removed from the data stream. If the Data Protocol is
set to ETX/ACK, ACK/NAK, or Series1, One Char Enquiry is automatically
disabled.
The options are Disable (the default) and Enable.
Printer Status
•
Disable . Printer status ignored.
•
ENQ/STX (see Table 9).
•
ENQ (see Table 10).
When enabled, the printer will respond to an ENQ character by sending a
status byte to the host. The type of status byte is determined by a Front Panel
Menu selection. The selections allowed are ENQ/STX and ENQ. The ENQ is
removed from the data stream.
Table 8. One Char Enquiry Response Characters
Printer State Response (hex)
Online and Buffer Not Full 20
Online and Buffer Full 21
Offline and Buffer Not Full 22
Offline and Buffer Full 23
Table 9. ENQ/STX Status Byte
Bit Printer Status
0 Set when the printer is not online or the buffer is full.
1 Set when the printer is offline.
2 Clear during a paper out or RibbonMinder fault.
3 Always set.
4 Set during a Head Open fault.
5 Set during a buffer overflow fault.
6 Set during a parity or framing error fault.
7 Always clear.