B&B Electronics QSU2-400-EMB Manual de usuario descargar pdf (Pagina 16)

Making external connections Quatech USB-to-Serial Adapter User’s Manual

Making external connections

Quatech USB-to-Serial adapters are equipped with male DB-9

connectors. The following figures and tables show the serial port

pinouts for RS-232 and RS-232/422/485 applications.

Figure 12 - DB-9 connector pinout

RS-232 serial connections

RS-232 devices are classified by their function as either Data

Terminal Equipment (DTE) or Data Communication Equipment

(DCE).

Figure 13 - Use of DTEs and DCEs in a communication link

Note: A DTE device is the

communication source. A DCE

device provides a communication

channel between two DTE-type

devices.

Quatech USB-to-Serial adapters are DTE devices that connect to

peripheral equipment through a male DB-9 connector. The following

table lists the serial port connector definitions.

Table 4 - RS-232 signals on DB-9 connector

RS-232 signal description DB-9

Data Carrier Detect (DCD) 1

Receive Data (RxD) 2

Transmit Data (TxD) 3

Data Terminal Ready (DTR) 4

Signal Ground (GND) 5

Data Set Ready (DSR) 6

Request To Send (RTS) 7

Clear To Send (CTS) 8

Ring Indicator (RI) 9

Page 12 Rev 1.01 (February 2007)

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B&B Electronics QSU2-400-EMB Manual de usuario Pagina 16