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Confidential
Chapter 4
Function Description
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 follows.
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.
The RTS signal indicates the BUSY/READY status of the TM printer and the customer display.
When either one is BUSY, the RTS signal will be RTS BUSY. Confirm the RTS signal when
sending data for the customer display.
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-S09 Developer's Guide
Function Description 4-1
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