B&B Electronics RS-422 manual RS-232 Connections/Operation, RS-232 Operation, RS-232 Pinouts

Page 46

Chapter 5: RS-232 Connections/Operation

The DB-9 male connector is configured as a standard RS-232 (DTE) serial port. Table 3 shows the signal names and pin numbers.

Table 3: RS-232 Pinouts

Name

Description

Direction

DB9M

 

 

(DTE)

Pin

 

 

 

 

DCD

Data Carrier Detect

Input

1

RD

Receive Data

Input

2

TD

Transmit Data

Output

3

DTR

Data Terminal Ready

Output

4

GND

Signal Ground

------

5

DSR

Data Set Ready

Input

6

RTS

Request to Send

Output

7

CTS

Clear to Send

Input

8

RI

Ring Indicator

Input

9

RS-232 Operation

RS-232 signal lines are referenced to Ground, and each signal can alternate above and below ground by the rated voltage (see Specifications for RS-232 Transmitter/Receiver). Typical input voltage levels range from –11 to –3 Volts or +3 to +11 Volts.

The primary RS-232 signals are Transmit (Tx) and Receive (Rx), so together with Ground, they make a “3-wire” interface.

The RTS and CTS signals are Handshaking lines used to indicate to the other device that data can be sent or received. These lines may be enabled or disabled on a byte-by-byte basis and are used to prevent buffer overrun or the loss of data.

Two secondary Handshaking signals are DTR and DSR. They are usually enabled when the device is powered up and the port is open. They may be used for flow control by some devices instead of RTS and CTS.

DCD is used by a modem to indicate Carrier to the computer so data can be sent/received. RI is output by a modem to indicate that the phone or FAX line has a incoming call, so it can be handled.

Documentation Number 3PCIO1-0903 Manual

Chapter 5

41

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Contents With Send Data Control Page Table of Contents RS-422/RS-485 CONNECTIONS/OPERATION Use ESD precautions for safe handling General Information FeaturesIntroduction Quick Start Specifications Accessories Device Driver Setting for RS-485 Mode Setup InspectionBefore Starting… Set the Jumpers Selection of Operating ModeJumper/Mode Table Install the Card Software Driver Installation Windows 95 orInsert Disc. Select CD-ROM Drive, Click Next Chapter Documentation Number 3PCIO1-0903 Manual Documentation Number 3PCIO1-0903 Manual Chapter Set DTR Operation Changing Com Port Number Example After renaming B&B Port from Com5 to Com3 Removal of Drivers/Card Chapter Documentation Number 3PCIO1-0903 Manual Windows 2000 Professional Chapter Documentation Number 3PCIO1-0903 Manual Documentation Number 3PCIO1-0903 Manual Chapter Chapter Documentation Number 3PCIO1-0903 Manual Select CD-ROM drives. Click Next Click Finish Windows XP Professional Click Continue Anyway Documentation Number 3PCIO1-0903 Manual Chapter Click Finish Next System Properties/Hardware/Device Manager Next Set DTR Operation Changing Com Port Number Example After renaming B&B Port from Com6 to Com2 Removal of Drivers/Card Windows Explorer, WINNT, INF, Oem2 and Oem3 files Show Hidden Files and Folders Setting Driver Options Example Advanced Settings Windows Advanced Com Port RenamingData Rate 1X or 4X Clock Speed Example Data Rate, Clock Speed, 4x WindowsFifo Settings Chapter Documentation Number 3PCIO1-0903 Manual RS-232 Pinouts RS-232 Connections/OperationRS-232 Operation Name Description DirectionDTR Operation In RS-232 Mode Example DTR Operation Select Normal WindowsRS-422/RS-485 Connections/Operation RS-422/485 Pinouts Name Description DirectionWire RS-422 or RS-485 Connections RS-422 & RS-485 Differential Signals RS-422 OperationExample Settings, DTR Operation, RS-485 Mode selected RS-485 OperationRS-485 Network Biasing Troubleshooting RS-232 Loopback w/Handshaking Connections USA Office Email support@bb-elec.com European OfficeAppendix a Jumper/Mode Settings Table a Jumper/ModeTable B.2 RS-232 DB9 to DB25 Conversion Cable Appendix B Connector PinoutsTable B.1 RS-232 Pinouts Name Description Direction DB9 Pin DB25 PinTable B.3 RS-422/485 Pinouts Name Description Direction Appendix C Troubleshooting With ComTest Com TestStart ComTest ExitAppendix D Declaration of Conformity Statement Declaration of Conformity
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RS-422 specifications

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