One Char Enquiry - Printronix T5000 User Manual

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 factory default) and Enable.
Printer Status
•
Disable. Printer status ignored.
•
ENQ/STX (see Table 7).
•
ENQ (see Table 8).
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.
214
Table 6. One Char Enquiry Response Characters
Printer State
Online and Buffer Not Full
Online and Buffer Full
Offline and Buffer Not Full
Offline and Buffer Full
Table 7. ENQ/STX Status Byte
Bit
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.
Response (hex)
20
21
22
23
Printer Status