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QL Series User Guide
Communications Ports
RS232C
Signal
Pin# 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
6NC No Connect
7 DSR input Data Set Ready
low to high transition turns
printer on, high to low transi-
tion turns printer off (if en-
abled)
8 DTR output Data Terminal Ready
set high when printer is on.
Set to battery voltage
for “S” versions( compatible
with Symbol™ PIM)
USB (QL Plus Series only)
Signal
Pin# Name Type Description
1 VBUS - USB Bus Power
2 USB - bi-directional I/O signals
3 USB + bi-directional I/O signals
4 USB_ID - Identifies A/B connector
5 Return Ground