Omega CN155, CN154, CN158 Connection of RS-485, Terminal resistance, Control of 3-state output

Page 13

Example: Mark state

T D+

>

T D-

 

Space state

T D+

<

T D-

 

Line converter

 

 

SR73A and 74A Controllers

FG (Earthing for protection) Shielding wire

 

terminal No.

T x D+

 

 

SD+ 2

T x D-

 

 

SD-

3

R x D+

 

 

RD+ 4

R x D-

 

 

RD-

5

SG

 

 

SG

1

7-2-3. Connection of RS-485

(1)The logical levels of input and output of this apparatus are basically as follows:

Mark state -Terminal < +Terminal

(including the state in which communication is not carried

out)

 

Space state

-Terminal > +Terminal

However, since the impedance of +terminal and -terminal of this apparatus is high until just before transmission, the above levels are output just before commencing transmission.

(2) Example of Connection of RS-485

Host computer

 

CN150 Controllers 1

FG (Earthing for protection)

Shielding wire

terminal No.

 

 

(+)

(+)

2

(-)

(-)

3

SG

SG

1

 

CN150 Controllers 2

 

 

terminal No.

 

(+)

2

 

(-)

3

 

SG

1

Terminal resistance (510)

7-2-4. Terminal resistance

As CN150 Series are not provided with terminal resistance, connect a 510resistance to only the last (the furthest from the host) station.

Note: If terminal resistance is connected to two or more, correct action is not guaranteed.

7-2-5. Control of 3-state output

(1)Since RS-422A and RS-485 employ the multi-drop system, in order to prevent signals from colliding, transmission output should be controlled to maintain high impedance while communication is not being made or signals are being received.

(2)It should be controlled so that high impedance turns to the normal state of output immediately before starting transmission and high impedance is restored immediately when transmission ends. Because 3-state control is delayed by about 3 msec. maximum from the transmission of the end bit of the end character, a delay time of about 4 msec. should be provided in case transmission is started immediately.

7-3. Setting of communication parameters

There are four communication-related parameters to be set as shown below. They are set by means of front keys except for changing the communication mode from remote to local.

[ ] Communication mode

[ ] Communication address

[ ] Communication data format

[ ] Communication rate

[ ] Delay

7-3-1. Communication mode selecting screen ( )

(1)Local Mode ( )

The COM lamp on the front panel goes out to allow the setting to be changed by the use of the front keys. In communication, only the change from local to remote and the read commands are valid.

(2)Remote Mode ( )

The COM lamp on the front panel turns on and the commands for read and write through communication become valid.

Front key operation works only to change from remote to local.

7-3-2. Communication address ( ) setting screen

RS-422A and RS-485 allow connection of a plurality of apparatuses but in fact, communication is carried out between two apparatuses. Therefore, the address of each apparatus is designated by a number between 00 and 99 so as to enable the designated apparatus to respond.

7-3-3. Communication data format ( ) selecting screen

Select data format of communication from 7b_E (data bit length

:7 bits, parity : even, stop bit : 1) or 8b_n (data bit length : 8bits, parity : none, stop bit : 1)

7-3-4. Communication rate ( ) selecting screen

A rate of transmission from the controller to the host is selected from among 1200, 2400, 4800 and 9600 bps.

7-3-5. Delay ( ) setting screen

In the case of RS-485, a minimum delay time for transmission from receiving a communication command is set. Delay time is a set value (0~255) 0.1 msec. Nevertheless, actual delay time includes time for processing the command added to the above delay time.

7-4. Communication protocol

7-4-1. Communication procedure

Communication is carried out for each block and the communication right alternates between the controller and the host from block to block.

Host computer

 

Controller (CN150 Series)

 

Transmission

(Reading)

Transmitting command block

 

 

 

 

 

 

Response

 

 

(Reading)

 

Returning response block

Transmitting command block

Transmission

(Reading)

 

 

 

 

 

Response

 

(Reading)

 

Returning response block

7-4-2. Explanation of block

(1) The data format in one block is shown below:

@

Higher

Lower

Text

:

Higher

 

Lower

CR

position

position

position

 

position

 

 

 

 

 

1

2

 

3

4

 

5

 

6

 

 

 

 

 

 

 

 

 

 

 

 

:Start character• • • • • @(40H) Shows the start of a

block.

- 11 -

Image 13
Contents Page Page Page Page How to remove the instrument out of the case Wiring Dimension of current transformer CT for heater break alarmExternal dimensions and panel cutout MountingInstruction for front panel Alarm type code table Power on and initial screen displayScreen instruction Screen changeBasic screen Instruction for screen change and each screenMeasuring range code table Soft start time setting screen screen No.14AT Auto tuning Setting of set value SVOperation Supplementary explanation of screensPID Screen No.2, 4 and 5 of mode 1 screen group Setting of alarmSupplement Auto return functionInstructions on Communication Error messageGeneral Connection of RS-422ACommunication mode selecting screen Setting of communication parametersCommunication address setting screen Delay setting screenData format Text Text formatRestrictions by commands, etc Communication errorNon-response process Write command Read commandList of transmitted/received data Specifications Heater Break Alarm option Alarm Output OptimalSet value Bias option Others

CN159, CN155, CN158, CN154 specifications

Omega watches have long been celebrated for their precision, durability, and innovative features, and models such as the CN154, CN158, CN155, and CN159 exemplify these qualities. Each of these timepieces showcases Omega's commitment to craftsmanship and cutting-edge technology.

The Omega CN154 model is notable for its sleek design, combining elegance with robust functionality. Its stainless-steel case ensures durability while maintaining a lightweight feel. The watch features a mesmerizing sapphire crystal that provides scratch resistance and enhances visibility, allowing wearers to appreciate the intricate dial details. Equipped with Omega's Co-Axial escapement technology, the CN154 offers exceptional accuracy and reduced friction, resulting in a longer service life.

Similarly, the Omega CN158 stands out with its distinctive aesthetic and advanced technical features. This model incorporates the brand's renowned chronometer certification, guaranteeing its precision. The CN158 utilizes a helium escape valve, an essential feature for professional divers, enabling it to withstand high pressures during underwater activities. The luminous hands and markers ensure visibility in low-light environments, making it ideal for both diving adventures and everyday wear.

The CN155 model focuses on functionality without compromising style. Its tachymetric scale on the bezel allows for precise speed calculations, catering to motorsport enthusiasts. The chronograph feature provides accurate timing capabilities, while the stainless-steel bracelet offers comfort and security. The watch's water resistance up to 300 meters enhances its versatility, making it a reliable companion for any occasion, be it a business meeting or an ocean dive.

Lastly, the Omega CN159 encapsulates luxury and performance. With a striking ceramic bezel and an intricately designed dial, this timepiece makes a bold statement. The CN159 is equipped with Omega's Master Chronometer technology, which ensures precision while also being resistant to magnetic interference. This allows it to maintain accuracy even in environments with strong magnetic fields. The watch also features a transparent case back, showcasing the exquisite craftsmanship of the automatic movement within.

In summary, the Omega CN154, CN158, CN155, and CN159 models represent the pinnacle of watchmaking innovation. They combine style, precision, and advanced technologies, making them excellent choices for discerning watch enthusiasts. Whether for professional use or personal style, these timepieces offer something for everyone, ensuring Omega remains a leader in the luxury watch industry.