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QL Plus Series User Guide
Communications Ports
RS-232C
Pin# Signal Name Type Description
1 RXD input Receive Data
2 TXD output Transmit Data
3 CTS input Clear To Send from host
4 RTS output Request To Send set high when
printer is ready to accept a
command or data
5 GND Ground
6 NC No Connect
7 DSR input Data Set Ready: low to high
transition turns printer on, high to
low transition turns printer off (if
enabled)
8 DTR output Data Terminal Ready: set high when
printer is on.
Set to battery voltage for “S”
versions (compatible with Symbol™
PIM)
8
7
6
4
2
1
5
3
Figure 27: RS-232C Communications Port (8 pin Circular DIN)