Communications: Serial Rs232C - Extech Instruments S3750THS User Manual

Portable receipt printer
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3.3 Communications:
The S3750THS Printer has two serial communication UARTs. It is able to
support two modes of communication simultaneously – Either RS232 and IrDA ( If
Dip switch # 1 is ON) or RS232 and 802.11b /BT (If Dip switch # 1 is OFF and Dip
Switch # 3 is ON).
Dip Switch # 2 is used to control the RS232 Port. If the Switch is turned ON the
RS232 port is disabled and if it is turned OFF the RS232 Port is enabled. If RS232
interface is not required, disabling the port will save battery power.
Bluetooth or 802.11b RF communication is available if optional daughter boards are
installed ( 802.11b). The printer can have either Bluetooth or 802.11b enabled but
not both of them at the same time.
3.3.1 Serial Communications specification:
The RS232C Interface signals for the S3750THS Series printers are
terminated on a 6 PIN RJ type data connector located on the side of the
printer.
Six connections are provided from the Serial Interface to the host computer.
The TABLE 3 below lists the Serial Interface signals and pin outs on the RJ
connector and the connector pin locations are shown in FIGURE 6.
A minimum of two connections are required for operation: RXD – pin 3 and
Common – pin 1
The communication Parameters: Baud rate, Data Bit and Parity must be set
same as the host device settings.
TABLE 3
FIGURE 6
– RJ DATA CONNECTOR
3
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Page 13

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