Printronix ProLine 5 Series Manual page 162

Idle Response
This option is for the Series 1 protocol. When enabled, the printer will send a
response character every two seconds while the number of valid bytes in the
buffer is less than 75 percent of the buffer size.
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.
Online and Buffer Not Full
Online and Buffer Full
Offline and Buffer Not Full
Offline and Buffer Full
The Poll Character is removed from the data stream. If the data is set to
ETX/ACK, ACK/NAK, or Series 1, One Char Enquiry is automatically disabled.
Configuration Menus
Printer State Response (hex)
20
21
22
23
4–109