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Confidential
Chapter 4
Function Description
The following functions are available when using the serial interface. Each function is described
below.
❏ DTR/DSR control
❏ XON/XOFF control
❏ Printer reset
DTR/DSR Control
The DTR signal indicates the BUSY/READY status of the TM printer; Space status indicates that
the TM printer is READY; and Mark status indicates the printer is BUSY. The handshaking
mode used by the TM printer to determine the conditions under which the printer becomes
BUSY is determined by a DIP switch setting on the printer, as shown below.
Table 4-1 TM printer BUSY conditions
Printer DIP Switch Setting Printer BUSY Condition
ON
OFF
The DSR signal indicates whether the host can receive data: the Space status indicates that the
host is ready to receive, and the Mark status indicates that the host is not able to receive.
Rev. B
• During power on or resetting
• While self-test is executing
• When the receive buffer is full
• At power on or reset
• During self-test
• When the cover is open
• When feeding paper with the FEED button
• When the printer has stopped due to being out
of paper
• When an error has occurred
• When the receive buffer is full
UB-U09 Developer's Guide
Function Description 4-1
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