RS-232↔RS-422 INTERFACE CONVERTER

RS-232 ↔ RS-422 Signal Flow Diagram

(Arrows indicate the direction of signal flow.)

RS-232

 

 

 

 

 

 

 

 

 

 

 

 

 

RS-422

(Port is DTE)

 

 

 

 

 

 

 

 

 

 

 

 

 

(Port is DCE)

 

 

 

 

 

 

 

 

 

 

 

 

 

TD

2

 

CR6

 

 

 

 

 

(RS-422 DATA LED)

SW1 A

 

 

Send Data A (-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22

Send Data B (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW1 B

 

RD

3

 

CR7

 

 

 

 

(RS-232 DATA LED)

 

 

 

 

 

 

 

6

Receive Data A (-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

Receive Data B (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR5

 

 

 

 

(RS-422 CTS LED)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RTS

4

 

 

 

 

 

 

 

 

 

 

 

 

7

Request to Send A (-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

25

Request to Send B (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CR4 (RS-232 CTS LED)

CTS 5

CR9 (RS-232 DSR LED)

DSR 6

CD 8

TXC 15

RXC 17

9Clear to Send A (-)

27 Clear to Send B (+)

11Data Mode A (-)

29 Data Mode B (+)

13Receiver Ready A (-)

31 Receiver Ready B (+)

5Send Timing A (-)

23 Send Timing B (+)

8Receive Timing A (-)

26 Receive Timing B (+)

DTR

20

 

 

CR8

 

 

 

 

(RS-422 DSR LED)

 

 

 

 

12

Terminal Ready A (-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

Terminal Ready B (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ETXC

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

Terminal Timing A (-)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

35 Terminal Timing B (+)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chassis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

1

Chassis or Frame

GND

 

 

 

 

 

 

 

 

 

 

 

 

GND

GND

 

 

 

 

 

 

 

 

 

 

 

Optional Jumper *

 

Signal

 

 

 

 

 

 

 

 

 

 

 

 

 

19

Signal GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

Receive Common

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

37

Transmit Common

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* Note: The optional jumper is removed (factory default

Figure 3-5. Signal Flow Diagram A.

13

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Black Box RS0232 manual RS-232 ↔ RS-422 Signal Flow Diagram
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RS0232, RS-422 specifications

Black Box is a prominent provider of high-quality networking solutions, and their RS0232 and RS-422 products exemplify their commitment to excellence in data communication. These serial interface converters are pivotal for seamless connectivity across various devices, ensuring reliable and robust signal transmission in industrial and commercial applications.

The RS0232 converter is designed to facilitate communication between RS-232 serial ports and RS-422/RS-485 systems. One of its standout features is the ability to support data rates up to 115.2 kbps, making it suitable for fast-paced environments where high-speed communication is essential. The unit is engineered for full-duplex communication, allowing simultaneous transmission and reception of data, which enhances efficiency.

In terms of connectivity, the Black Box RS0232 converter provides a DB9 female connector for RS-232, while it leverages terminal block connections for RS-422/RS-485. This versatility provides users with flexible integration options, enabling a wide range of applications from point-to-point to multipoint configurations.

On the other hand, the RS-422 converter embodies robust design principles that make it resilient in challenging operating conditions. It features surge protection mechanisms, ensuring the safety of connected devices against voltage spikes and transients. The unit operates over a wide temperature range, typically between -40°C to 70°C, making it suitable for outdoor installations and harsh environments.

Both converters are equipped with LED indicators that provide real-time status updates, such as power, data transmission, and interface activity. This feature aids in diagnostics and troubleshooting, allowing users to quickly identify and resolve potential issues.

In terms of technologies, these converters utilize differential signaling, which improves noise immunity and increases the effective transmission distance up to 4000 feet. This capability is particularly advantageous for long-distance data transmission, common in industrial settings and expansive facilities.

Overall, Black Box's RS0232 and RS-422 converters are characterized by their durability, high performance, and user-friendly design. They offer exceptional reliability and efficiency, making them indispensable tools for businesses requiring robust data communication solutions. Whether used in automation, telecommunications, or other sectors, these converters stand out as reliable components that enhance operational capabilities and ensure data integrity across networks.
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