Browse Prior Art Database

Efficient and Adaptable Serial Protocol for Simple Human Machine Interface Panels

IP.com Disclosure Number: IPCOM000198071D
Published in the IP.com Journal: Volume 10 Issue 8A (2010-08-10)
Included in the Prior Art Database: 2010-Aug-10
Document File: 5 page(s) / 258K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

SLPs (SLP: Serial Link Protocol) which enable a low cost HMI (Human-Machine Interface) to communicate with some other unit are often very inflexible, because they are difficult to adapt to any other HMI unit. In the following a novel solution is proposed. The solution provides a very simple but adaptable SLP which enables a simple HMI to communicate with some other unit for some purpose, e.g., an inverter unit with a connection for an HMI unit that provides programming and controls information. This simple and adaptable approach is achieved by considering the important data in a message and removing anything that is hardware specific. The approach recommended for this purpose is as follows: • The data within the transmitted message from the HMI simply contains information of which keys on the HMI are pressed, e.g., one bit is used to indicate the actual key-press status of each key, and one bit is used to display a long press for each key, i.e., the HMI internally detects how long a key is pressed, and sets the appropriate long press bit. Some bits can also be used to indicate special key-press combinations, i.e., three keys pressed together may do a key-lock function. Figure 1 shows an example of data in a transmitted message containing key information.

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Efficient and Adaptable Serial Protocol for Simple Human Machine Interface

Panels

Idea: Philip Newton, GB-Congleton

SLPs (SLP: Serial Link Protocol) which enable a low cost HMI (Human-Machine In communicate with some other unit are often very inflexible, because they are other HM
adaptable SLP which enables a simple HMI to communicate with some other unit f e.g., an inverter unit with a connection for an HMI unit that provides programm infor

This simple and adaptable approach is achieved by considering the important dat removing anything that is hardware specific. The approach recommended for this follows:

• The data within the transmitted message from the HMI simply contains inf keys on th
each key, and one bit is used to display a long press for each key, i.e., the detects how long a key is pressed, and sets the appropriate long press bit. be used to indicate special key-press combinations, i.e., three key
a key-lock function. Figure 1 shows an example of data in a transmitted mes key information.

• The data within
displayed on the HMI. Such an HMI unit typically displays one or more lin Additionally, a display typically contains icons like warning triangles or units like (frequency) or V (voltage). It is therefore necessary for the reply message define whether an icon is displayed or not, and whether an icon or a text ch
or not. Figure 2 shows an example for a reply message that contains text string additional information.

• Several bits are used for icon information like on, off, and flashing. Icons on an LCD di are, e.g., decimal points, signs, units and fault-icons (LCD: Light Emitting D
also shown that the message gives a null-terminated string to each display
word whose bits define which characters in the string to flash. It is easy to
lines to the message or ent
unit in an HMI system, the icon-bits may have the in Figure 3 shown

Figure 4 to Figure
Figure 4 shows an exemplary frame format for the transmission from a BOP to a messages are generally used to transmit key-press information. Some of the de dedicated to the applied protocol and the local operator p
message; bits are used to indicate the status of the keys with different bits for long k key-presses, and specialist key-presses, e. g., double-off or key-locks. Figure 6 depict message fro

The proposed solution can advantageously be

terface) to

                                            difficult to adapt to any I unit. In the following a novel solution is proposed. The solution provides a very simple but or some purpose, ing and controls

mation.

a in a message and

purpose is as

                                        ormation of which e HMI are pressed, e.g., one bit is used to indicate the actual key-press status of

HMI internally

      Some bits can also s pressed together may do sage containing

the reply message for the HMI simply contains the information that has to be es of text messages.

Hz

to contain bits which aracter is flashing and its

       splay...