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receives the ETX signal, it will acknowledge the ETX, thereby acknowledging it has received the
entire block of data.
•
ACK / NAK. ACK means acknowledge; the device acknowledges it has accepted a transmission.
NAK means negative acknowledge; the device did not receive the transmission.
•
SERIES1 1 CHAR. The printer controls the flow of communication from the host by turning the
transmission on and off using response characters sent to the host. If the number of valid bytes in the
buffer reaches 75 percent of the buffer size, the online or offline and buffer full response character is
sent. If the buffer is completely full, an online or offline buffer full response is sent every time a
character is sent from the host. Whenever the printer state changes to online or offline, the
appropriate response character is sent. If the idle response option is 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. If a poll character is received (configurable from the Poll Character xx Hex
option on the front panel from hex 0 through FF), the printer will send a response character n
milliseconds later (configurable from the Poll Character xx MS on the front panel from 0 through 30).
This n milliseconds is called the poll delay. The poll character will be removed from the input data
stream and will not be processed. This may cause problems with the transmission of binary data
(e.g., control codes, bit image, etc.). If a poll delay is started due to the receipt of a poll character and
another poll character is received, the second poll character has no effect and is removed from the
input data stream. If a transition (from buffer full to empty or online to offline) occurs during a poll
delay, the new printer state will be sent at the end of the poll delay.
The response characters are described in Table 7.
•
SERIES1 2 CHAR. This protocol behaves exactly the same as the Series1 Char except there is a
two-character response to the host. The response characters are described in Table 8.
•
ENQ/ACK. Enquiry/Acknowledge. The host controls the flow of data by sending an ENQ (Enquiry,
decimal 5, Control-E) approximately every 80 characters. When the printer is ready for more data, it
replies with an ACK (Acknowledge, decimal 6, Control-F).
Table 7 Series1 Char Response Characters
Printer State
Online and Buffer Empty
Online and Buffer Full
Offline and Buffer Empty
Offline and Buffer Full
Table 8 Series1 2 Char Response Characters
Printer State
Online and Buffer Empty
Online and Buffer Full
Offline and Buffer Empty
Offline and Buffer Full
Response
CR
3
0
2
Response
1 CR
3 CR
0 CR
2 CR
83
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