The connections to a standard PC COM port are as follows:
DB-9 Pin
Name
Description (refers to PC)
RJ12 Pin
3
TxD
Serial Data Output
3
2
RxD
Serial Data Input
4
4 DTR
Handshaking
Output
2
6 & 8
CTS & DSR
Busy Input
5
5
SGND
Signal Common 0V
6
The wake-up input (pin 2 of the RJ12) can be driven by a normal RS-232 handshaking output and
activates the printer when a positive voltage ('space' condition) is asserted. Connecting it to the PC DTR
signal wakes the printer when the COM port is 'opened'. It may alternatively be tied to a positive voltage
in the range +3V -> +12V to keep the printer awake permanently. In this case, the printer will 'attempt' to
go to sleep if the normal inactivity time-out elapses, but will merely reset and then re-start. This behavior
may be avoided by switching off the sleep period timeout.
EMC STATEMENT
The LCM20 and LCM25 printers are fully EMC (Electro-Magnetic Compatibility) compliant and are CE
marked accordingly. A Declaration of Conformity, in accordance with the EMC Directive 89/336/EEC
(and as amended) is available on request.
EMC Caution
System EMC compliance remains the responsibility of the system designer. It is recommended that
shielded cables are used; grounding arrangements will depend on the application.
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