Printronix SL_T5R Energy Star - Manual (Page 236)

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Chapter 3 SERIAL PORT
The response characters are described below.
• Series1 2 Char. This protocol behaves exactly the same as the Series 1
Char except there is a two-character response to the host. The response
characters are described in the following table:
• ENQ/ACK . Enquiry/Acknowledge. The host controls the flow of
communication to the printer by sending a block of data and ending
the block with an Enquiry (ENQ) character. When the printer receives
the ENQ Character, it acknowledges the ENQ, thereby
acknowledging it has received the entire block of data. Status will also
be sent before the ACK. The status is as follows:
• 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.
Printer State Response
Online and Buffer Empty CR
Online and Buffer Full 3
Offline and Buffer Empty 0
Offline and Buffer Full 2
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
Printer State Status
Online 40 06
Online or Paper Motion Fault 43
Platen Open or Paper Out 47