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PANDUIT TDP4*H GMTDPH-MAN
Page 6-9
Section 6: Interface Specifications
ENQUIRE/ACK/NAK
In the Bi-Com 4 mode, the host transmits an ENQ (05 hexadecimal) to the printer and the printer will
respond with its status within five milliseconds. If printing, it will respond upon finishing the current label,
then resume printing. In order for this protocol to work properly with an RS232C Optional Interface, pin 6
(DTR) and pin 5 (CTS) must be held high by the host. One way to ensure these pins are always in the
correct state is to tie pin 20 (DTR) to pin 6 (DSR) and pin 4 (RTS) to pin 5 (CTS) at the printer end of
the cable.
ENQUIRE (ENQ)
Upon receipt of an ENQ command, the printer responds with 25 bytes of status information bounded by
an STX/ETX pair. The Bi-Com protocol works only in the Multi Job Buffer mode. The status information is
defined as follows:
<STX>{ 2 Byte ID}{1 Status Byte}{6 Byte Label Remaining}{16 Byte Job Name}<ETX>
ID - This is a two byte number identifying the current print job ID. The print job ID is defined using the
<ESC>ID Job ID command transmitted with the print job (see Job ID Store in the command listing for
more information on how to use this command). The range is from 00 to 99.
Status - A single byte defining the current status of the printer (see the Status Byte Definition table).
Label Remaining - Six bytes defining the number of labels remaining in the current print job. The range
is from 000000 to 999999 labels.
Job Name - 16 bytes of ASCII characters identifying the name assigned to the job by the <ESC>WK
Job Name command. If the Job Name is less than 16 characters, the field will be padded with leading
zeroes.
If an ENQ is received after the print job specified in the ID bytes has been completed, or there is no data
in the buffer, the printer will respond with two “space” characters (20 hexadecimal) for the ID number, six
“zero” characters (30 hexadecimal) in the Remaining Labels bytes and the 16 byte Job Name.
CANCEL (CAN)
If a CAN (18 hexadecimal) command is received , it will stop the print job and clear all data from the
receive and print buffers. A delay of five milliseconds or more is required before any new data can be
downloaded. The CAN command is effective immediately upon receipt, even if the printer is off-line or in
an error condition. The printer will return an ACK (06 hexadecimal) if there is no printer error condition
and a NAK (15 hexadecimal) if an error condition exists.
PRINT JOB
Upon receipt of a valid print job (<ESC>A . . . <ESC>Z), an ACK (06 hexadecimal) will be returned by the
printer if there are no errors and a NAK (16 hexadecimal) if a printer error exists.