INTERFACE DETAILS
RS-232 SERIAL INTERFACE (APPLIES TO ALL MODELS)
All LCM20 and LCM25 printers have an industry standard RS-232 interface. The default parameters are
9600 baud, 8 data bits, 1 stop bit and no parity. Other baud rates can be programmed by control codes,
or by using a setup utility. Contact Printek Technical Support for information regarding the setup utility.
Serial data is expected in standard RS-232C format with -12V meaning 'mark' or '1' and +12V a logical '0',
with reference to the common ground. The serial data output line, TxD, transmits XON/XOFF and status
information to the host at the same Baud rate and in the same format as the serial data input. The
hardware busy line is true (nominal -12V) when busy. Both serial output lines will relax to approximately
0V when the printer is in sleep mode, and the user must allow a short period after awakening before
relying on the values of these signals.
Some host equipment use a constant space condition (+12V) to indicate a reset condition or wait state.
Some battery powered host equipment present the same output signal when they go to sleep. The printer
can be set to ignore this condition as detailed in the Programmer’s Manual, but even then this type of host
behavior may result in one or more spurious characters being received and printed, or the printer may be
prevented from going to sleep.
IrDA INTERFACE (APPLIES TO LCM20 IRDA AND LCM25 IRDA ONLY)
IrDA models feature an Infra-Red window on the front of the body. It includes special hardware which
wakes the printer when any Infra-Red activity is detected. In order to reduce the occurrence of 'false
triggers', the sensitivity of this wake-up sensor is reduced. It may be necessary to bring the host IrDA
device fairly close to the printer before it will wake up.
Once awake, the printer will respond to communications from an IrDA compliant primary device. The
printer supports 'point-to-point' applications (i.e. one primary device and one secondary device). It
operates only as a secondary device, and cannot initiate a link between devices.
Once a link is established then the printer shows a red indicator through the IR window on the front. The
link will continue as long as the devices are maintained in line-of-sight and within operating range. While
a link is maintained, data may be exchanged freely between the two devices.
The protocols supported are as follows: IrPHY V1.0, IrLAP, IrLMP, IAS, TinyTP and IrCOMM 9-wire.
BLUETOOTH INTERFACE (APPLIES TO LCM20 BLUETOOTH AND LCM25 BLUETOOTH ONLY)
Bluetooth models include a class 2 implementation of the Panasonic PAN1440 module, which is
Bluetooth 1.1 compliant, and is certified to EN 300 328. The protocols and profiles supported are as
follows: LM, L2CAP, RFCOMM, SDP, TCS, SPP (Serial Port Profile).
The detail of how to establish a Bluetooth link and transfer data will vary greatly depending on the primary
host device. However, the process will generally involve the following stages:
i. Discovery of Bluetooth devices;
ii. Discovery of the printer’s services;
iii. Selection of the Serial Port Profile;
iv. It may be necessary to Pair with the printer;
v. Connecting to the printer.
Note. The PIN for making a secure connection to the printer is pre-set to “1234”.
Usually the Bluetooth link is maintained for as long as the devices are within operating range. While the
link is active, data may be exchanged freely between the two devices. Occasionally the link may be lost,
in which case the user should re-initiate the link from the primary host as described above.
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