Chapter 4 Parameter SettingsDD Series

 

 

 

 

 

 

 

 

 

 

11-bit character frame (For RTU):

 

 

 

 

 

 

 

 

 

 

( 8.N.2 )

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start

0

1

2

3

4

5

6

7

Stop

Stop

 

 

 

bit

bit

bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-bit character

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

-bit character frame

 

 

 

 

 

 

 

 

( 8.E.1 )

 

 

 

 

Even

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start

0

1

2

3

4

5

6

7

Stop

 

 

 

bit

parity

bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-bit character

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

-bit character frame

 

 

 

 

 

 

 

( 8.O.1 )

 

 

 

 

 

Odd

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Start

0

1

2

3

4

5

6

7

Stop

 

 

 

bit

parity

bit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-bit character

11-bit character frame

3.1Communication Protocol Communication Data Frame: ASCII mode:

STX

Start character ‘:’ (3AH)

 

 

Address Hi

Communication address:

 

8-bit address consists of 2 ASCII codes

Address Lo

 

 

Function Hi

Command code:

 

8-bit command consists of 2 ASCII codes

Function Lo

 

 

DATA (n-1)

Contents of data:

 

Nx8-bit data consist of 2n ASCII codes

…….

 

n<=16, maximum of 32 ASCII codes

DATA 0

 

 

LRC CHK Hi

LRC check sum:

 

8-bit check sum consists of 2 ASCII codes

LRC CHK Lo

 

 

END Hi

End characters:

 

END1= CR (0DH), END0= LF(0AH)

END Lo

 

 

RTU mode:

 

 

 

START

A silent interval of more than 10 ms

 

 

Address

Communication address: 8-bit address

 

 

Function

Command code: 8-bit command

 

 

DATA (n-1)

Contents of data:

 

…….

n×8-bit data, n<=16

 

DATA 0

 

 

 

CRC CHK Low

CRC check sum:

 

16-bit check sum consists of 2 8-bit characters

CRC CHK High

 

 

END

A silent interval of more than 10 ms

 

 

 

4-68

Page 92
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3Com VFD-D D manual Start Stop

VFD-D D specifications

The 3Com VFD-D D is an advanced networking solution designed to meet the demands of modern communication and connectivity. As part of 3Com's extensive portfolio of networking products, this device stands out due to its robust features, innovative technologies, and characteristics that cater to various enterprise environments.

One of the main features of the 3Com VFD-D D is its high-speed data processing capability. Operating at speeds that comfortably support high-bandwidth applications, the device is equipped to handle a multitude of simultaneous connections without compromising performance. This makes it an ideal choice for businesses where consistent, fast access to data is critical.

In terms of connectivity options, the VFD-D D supports a variety of protocols, allowing it to seamlessly integrate with existing infrastructure. Whether through Ethernet, Fiber Channel, or wireless technologies, the device offers versatility in connecting diverse network configurations. This adaptability ensures that organizations can optimize their network setups according to their specific requirements.

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Moreover, the VFD-D D is designed with scalability in mind. Its modular architecture allows businesses to expand their network capabilities as needed, ensuring that the device can grow alongside their evolving requirements. This flexibility helps organizations manage costs effectively while preparing for future technological advancements.

Another characteristic that sets the 3Com VFD-D D apart is its user-friendly management interface. Administration tasks can be performed quickly and intuitively, reducing the burden on IT staff while enabling efficient network monitoring and troubleshooting. With real-time analytics and reporting capabilities, organizations can gain valuable insights into their network's performance.

Overall, the 3Com VFD-D D combines speed, security, and scalability in a single device, making it a powerful addition to any enterprise network. Its advanced features and technologies are tailored to support the dynamic needs of modern businesses, ensuring reliable performance and robust connectivity in an increasingly interconnected world.