Printronix T8000 Administrator's Manual page 180

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.
Disable
Enable
Factory Default
With this feature, the printer will respond to an ENQ character by sending a
status byte to the host. The type of status byte is determined by this menu.
The selections allowed are ENQ/STX and ENQ.
Disable
ENQ / STX
ENQ
Factory Default
IMPORTANT
180
Host IO > Serial > One Char Enquiry
Printer State
ONLINE and Buffer Not Full
ONLINE and Buffer Full
OFFLINE and Buffer Not Full
OFFLINE and Buffer Full
Disable
Host IO > Serial > Printer Status
Printer status is not returned to the host.
See Table 5
See Table 6
Disable
The ENQ is removed from the data stream.
Response (hex)
22
23
20
21