TWI769840B - Rs-485 circuit and communication system - Google Patents
Rs-485 circuit and communication system Download PDFInfo
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Abstract
Description
本申請涉及一種通訊介面電路,且特別是有關於一種RS-485電路與通訊系統。The present application relates to a communication interface circuit, and in particular, to an RS-485 circuit and a communication system.
RS-485為常見的串列通訊標準,是一種藉由平衡發送和差分接收實現兩個裝置之間的通訊方式。RS-485 is a common serial communication standard, which is a communication method between two devices through balanced transmission and differential reception.
基於RS-485的電器特性為半雙工模式(Half Duplex),使得通過RS-485介面進行通訊的兩個裝置之間不能同時進行資料發送和接收。因此,同一時間僅能有一個裝置傳送資料,若有另一裝置需要傳送資料時,需等待正在傳送資料的裝置完成資料的發送後才可進行。The electrical characteristic based on RS-485 is Half Duplex, which makes it impossible to send and receive data at the same time between two devices that communicate through the RS-485 interface. Therefore, only one device can transmit data at the same time. If another device needs to transmit data, it needs to wait for the device that is transmitting the data to complete the data transmission before proceeding.
一般而言,需要通過裝置的處理模組(例如:微處理器、中央處理器或單晶片)輸出控制信號至RS-485介面晶片,以實現RS-485介面晶片的資料收發狀態的切換。然而上述方式存在因需要在裝置的處理模組上增加額外的軟體代碼來實現狀態切換的控制,而造成增加軟體開發的工作量,浪費研發的人力資源的問題。Generally speaking, it is necessary to output control signals to the RS-485 interface chip through the processing module (eg, microprocessor, central processing unit or single chip) of the device, so as to realize the switching of the data sending and receiving state of the RS-485 interface chip. However, the above method has the problem of increasing the workload of software development and wasting human resources for research and development because additional software codes need to be added to the processing module of the device to realize the control of state switching.
本申請的主要目的在於提供一種RS-485電路與通訊系統,解決現有技術中存在因需要在裝置的處理模組上增加額外的軟體代碼來實現狀態切換的控制,而造成增加軟體開發的工作量,浪費研發的人力資源的問題。The main purpose of the present application is to provide an RS-485 circuit and communication system, which solves the problem of increasing the workload of software development due to the need to add additional software codes to the processing module of the device to realize the control of state switching in the prior art. , the problem of wasting human resources in R&D.
為了實現上述目的,本申請是這樣實現的:In order to achieve the above purpose, this application is implemented as follows:
第一方面,提供了一種RS-485電路,設置於包括處理模組的電子裝置中。RS-485電路包括:RS-485介面晶片、啟動偵測器、積體匯流排電路與計數器。其中,RS-485介面晶片的預設狀態為資料接收狀態且包括:資料輸入端與致能端,資料輸入端用以接收來自處理模組的資料信號;致能端用以接收啟動信號後,使RS-485介面晶片處於資料發送狀態;及用以接收切換信號後,使RS-485介面晶片處於資料接收狀態。啟動偵測器用以偵測到資料信號的第一個信號邊緣而產生啟動信號至致能端。積體匯流排電路連接處理模組,計數器連接積體匯流排電路與致能端。計數器包括暫存器,來自處理模組的計數值通過積體匯流排電路儲存於暫存器,使得計數器基於計數值進行計數,並於計數到期時輸出切換信號至致能端,其中,處理模組基於資料信號的資料長度與鮑率產生計數值。In a first aspect, an RS-485 circuit is provided, which is provided in an electronic device including a processing module. The RS-485 circuit includes: RS-485 interface chip, start detector, integrated busbar circuit and counter. The default state of the RS-485 interface chip is the data receiving state and includes: a data input terminal and an enabling terminal. The data input terminal is used to receive data signals from the processing module; The RS-485 interface chip is in a data sending state; and after receiving the switching signal, the RS-485 interface chip is in a data receiving state. The activation detector is used for detecting the first signal edge of the data signal to generate an activation signal to the enabling end. The integrated bus circuit is connected to the processing module, and the counter is connected to the integrated bus circuit and the enabling terminal. The counter includes a register, and the count value from the processing module is stored in the register through the integrated bus circuit, so that the counter counts based on the count value, and outputs a switching signal to the enabling end when the count expires, wherein the processing The module generates count values based on the data length and baud rate of the data signal.
第二方面,提供一種通訊系統,其包括:處理模組、通訊匯流排與RS-485電路,其中,RS-485電路通過通訊匯流排連接處理模組。處理模組用以基於資料信號的資料長度與鮑率產生計數值;RS-485電路包括:RS-485介面晶片、啟動偵測器、積體匯流排電路與計數器。其中,RS-485介面晶片的預設狀態為資料接收狀態且包括:資料輸入端與致能端,資料輸入端用以接收來自處理模組的資料信號;致能端用以接收啟動信號後,使RS-485介面晶片處於資料發送狀態;及用以接收切換信號後,使RS-485介面晶片處於資料接收狀態。啟動偵測器用以偵測到資料信號的第一個信號邊緣而產生啟動信號至致能端。積體匯流排電路連接處理模組,計數器連接積體匯流排電路與致能端。計數器包括暫存器,來自處理模組的計數值通過積體匯流排電路儲存於暫存器,使得計數器基於計數值進行計數,並於計數到期時輸出切換信號至致能端。In a second aspect, a communication system is provided, which includes: a processing module, a communication bus and an RS-485 circuit, wherein the RS-485 circuit is connected to the processing module through the communication bus. The processing module is used to generate a count value based on the data length and baud rate of the data signal; the RS-485 circuit includes: an RS-485 interface chip, a startup detector, an integrated bus circuit and a counter. The default state of the RS-485 interface chip is the data receiving state and includes: a data input terminal and an enabling terminal. The data input terminal is used to receive data signals from the processing module; The RS-485 interface chip is in a data sending state; and after receiving the switching signal, the RS-485 interface chip is in a data receiving state. The activation detector is used for detecting the first signal edge of the data signal to generate an activation signal to the enabling end. The integrated bus circuit is connected to the processing module, and the counter is connected to the integrated bus circuit and the enabling terminal. The counter includes a register, and the count value from the processing module is stored in the register through the integrated bus circuit, so that the counter counts based on the count value, and outputs a switching signal to the enable terminal when the count expires.
在本申請中,通過啟動偵測器、控制模組與計數器的設置,使得RS-485電路可由硬體方式自動判斷RS-485介面晶片的資料傳輸方向及傳輸時間,避免因資料尚未完全傳送完畢便將傳輸方向進行切換或者資料傳輸完畢卻未及時切換傳輸方向,而造成資料傳輸上的錯誤,也可解決現有技術中存在因需要在裝置的處理模組上增加額外的軟體代碼來實現狀態切換的控制,而造成增加軟體開發的工作量,浪費研發的人力資源的問題。In this application, by activating the settings of the detector, the control module and the counter, the RS-485 circuit can automatically determine the data transmission direction and transmission time of the RS-485 interface chip by hardware, so as to avoid the data transmission not being completed. The transmission direction is switched or the transmission direction is not switched in time after the data transmission is completed, resulting in errors in data transmission. It can also solve the problem in the prior art that additional software codes need to be added to the processing module of the device to realize state switching. control, resulting in increased software development workload and waste of R&D human resources.
以下將配合相關圖式來說明本發明的實施例。在這些圖式中,相同的標號表示相同或類似的組件或方法流程。The embodiments of the present invention will be described below with reference to the relevant drawings. In the figures, the same reference numbers refer to the same or similar components or method flows.
必須瞭解的是,使用在本說明書中的「包含」、「包括 」等詞,是用於表示存在特定的技術特徵、數值、方法步驟、作業處理、元件和/或組件,但並不排除可加上更多的技術特徵、數值、方法步驟、作業處理、元件、組件,或以上的任意組合。It must be understood that the words "comprising" and "comprising" used in this specification are used to indicate the existence of specific technical features, values, method steps, operation processes, elements and/or components, but do not exclude the possibility of Plus more technical features, values, method steps, job processes, elements, components, or any combination of the above.
必須瞭解的是,當組件描述為「連接 」或「耦接 」至另一組件時,可以是直接連結、或耦接至其他組件,可能出現中間組件。相反地,當組件描述為「直接連接 」或「直接耦接 」至另一組件時,其中不存在任何中間組件。It must be understood that when an element is described as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, and intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
請參閱圖1,其為依據本申請的RS-485電路的一實施例方塊圖。如圖1所示,在本實施例中,RS-485電路100設置於包括處理模組(未繪製)的電子裝置(未繪製)中,且RS-485電路100包括:RS-485介面晶片110、啟動偵測器120、積體匯流排電路130與計數器140,積體匯流排電路130連接所述處理模組與計數器140,啟動偵測器120與計數器140分別連接RS-485介面晶片110;RS-485介面晶片110可通過RS-485匯流排50與其他RS-485介面晶片(未繪製)連接,以使配置有RS-485介面晶片110的電子裝置通過RS-485匯流排50與配置有所述其他RS-485介面晶片的電子裝置(未繪製)進行資料發送和接收。其中,由於積體匯流排電路130具有佔用的空間非常小的優勢,可減少了電子裝置的印刷電路板的空間,降低了互連成本;另外,積體匯流排電路130僅具有兩條信號線,對使用者而言,操作上更顯得簡單且方便,且可減少與其連接的所述處理模組的引腳數量,避免浪費所述處理模組的I/O資源。Please refer to FIG. 1 , which is a block diagram of an embodiment of an RS-485 circuit according to the present application. As shown in FIG. 1 , in this embodiment, the RS-485
在本實施例中,RS-485介面晶片110的預設狀態為資料接收狀態且包括:資料輸入端111與致能端112,資料輸入端111用以接收資料信號;致能端112用以接收啟動信號後,使RS-485介面晶片110處於資料發送狀態;及用以接收切換信號後,使RS-485介面晶片110處於資料接收狀態。需注意的是,RS-485介面晶片110預設為資料接收狀態時,所述資料信號可預設但不限於高準位信號,致能端112接收到的信號可預設但不限於高準位信號;當所述資料信號開始發生信號狀態轉換(即所述資料信號包括信號邊緣)時,代表配置有RS-485介面晶片110的裝置要開始傳輸資料,RS-485介面晶片110需切換為資料發送狀態,但本實施例並非用以限定本發明。舉例而言,RS-485介面晶片110預設為資料接收狀態時,所述資料信號也可預設為低準位信號,致能端112接收到的信號也可預設為低準位信號。In this embodiment, the default state of the RS-485
在一實施例中,當RS-485介面晶片110預設為資料接收狀態且致能端112接收到的信號可預設為高準位信號時,所述啟動信號可為低準位信號,所述切換信號可為高準位信號。在另一實施例中,當RS-485介面晶片110預設為資料接收狀態且致能端112接收到的信號可預設為低準位信號時,所述啟動信號可為高準位信號,所述切換信號可為低準位信號。In one embodiment, when the RS-485
在一實施例中,RS-485介面晶片110還可包括:差分信號收發端113,當RS-485介面晶片110處於資料發送狀態時,RS-485介面晶片110基於資料輸入端111所接收到的資料信號通過差分信號收發端113輸出差分信號至RS-485匯流排50;當RS-485介面晶片110處於資料接收狀態時,RS-485介面晶片110通過差分信號收發端113接收來自RS-485匯流排50的另一差分信號。更詳細地說,差分信號收發端113可包括差分信號引腳113a與差分信號引腳113b,當RS-485介面晶片110處於資料發送狀態時,RS-485介面晶片110基於資料輸入端111所接收到的資料信號通過差分信號引腳113a與差分信號引腳113b輸出差分信號至RS-485匯流排50;當RS-485介面晶片110處於資料接收狀態時,RS-485介面晶片110通過差分信號引腳113a與差分信號引腳113b接收來自RS-485匯流排50的另一差分信號。In one embodiment, the RS-485
在一實施例中,RS-485介面晶片110還可包括:資料輸出端114,當RS-485介面晶片110處於資料接收狀態時,RS-485介面晶片110基於差分信號收發端113接收到的另一差分信號通過資料輸出端114輸出另一資料信號。In one embodiment, the RS-485
在一實施例中,RS-485介面晶片110包括傳送邏輯單元60與接收邏輯單元70,其中,傳送邏輯單元60的輸入端連接資料輸入端111,傳送邏輯單元60的輸出端連接差分信號收發端113,傳送邏輯單元60的控制端連接致能端112;接收邏輯單元70的輸入端連接差分信號收發端113,接收邏輯單元70的輸出端連接資料輸出端114,接收邏輯單元70的控制端連接致能端112。需注意的是,當RS-485介面晶片110預設為資料接收狀態時,傳送邏輯單元60不會進行運作,接收邏輯單元70會進行運作;當RS-485介面晶片110預設為資料發送狀態時,傳送邏輯單元60會進行運作,接收邏輯單元70不會進行運作。In one embodiment, the RS-485
在本實施例中,啟動偵測器120用以偵測到資料信號的第一個信號邊緣而產生啟動信號至致能端112。換句話說,當所述資料信號開始發生信號狀態轉換(即所述資料信號包括信號邊緣)時,代表配置有RS-485介面晶片110的裝置要開始傳輸資料,因此,啟動偵測器120偵測到所述資料信號的第一個信號邊緣時即產生並傳輸所述啟動信號至致能端112,以使RS-485介面晶片110切換為資料發送狀態。其中,當所述資料信號預設為高準位信號時,所述第一個信號邊緣可為下降緣;當所述資料信號預設為低準位信號時,所述第一個信號邊緣可為上升緣,可依據實際需求進行調整。In this embodiment, the enable
在一實施例中,當啟動偵測器120偵測到資料信號的第一個信號邊緣時,產生另一啟動信號給計數器140,以啟動計數器140。In one embodiment, when the enable
在一實施例中,啟動偵測器120還可用以持續偵測資料信號的信號邊緣,當啟動偵測器120於一預設時間內未偵測到信號邊緣時,則於該預設時間後第一次偵測到信號邊緣時產生啟動信號。換句話說,所述資料信號的第一個信號邊緣可為但不限於在該預設時間後第一次偵測到的信號邊緣。其中,所述預設時間的大小可依據實際需求進行調整。In one embodiment, the
在本實施例中,計數器140包括暫存器142,來自所述處理模組的計數值通過積體匯流排電路130儲存於暫存器142,使得計數器140基於計數值進行計數,並於計數到期時輸出切換信號至致能端112。其中,當計數器140計數到所述計數值時,代表計數器140計數到期,也代表資料傳輸完畢(因為所述處理模組基於資料信號的資料長度與鮑率產生所述計數值)。其中,所述資料信號的資料長度係可為但不限於所述資料信號的第一個信號邊緣到最後一個信號邊緣之間的長度,所述鮑率為傳輸所述資料信號的速率。需注意的是,所述資料信號的倒數第二個信號邊緣與最後一個信號邊緣之間的時序差不可大於上述預設時間。In this embodiment, the
在一實施例中,積體匯流排電路130與計數器140有相對應的鮑率,即可在相對應的鮑率下,於計數器140計數到期時告知致能端112,使致能端112控制RS-485介面晶片110切換為資料接收狀態。此外,由於積體匯流排電路130與計數器140有相對應的鮑率,所以計數器140不會單單只計數一種鮑率,而需要有計數不同鮑率的功能。In one embodiment, the
請參閱圖2,其為依據本申請的通訊系統的一實施例方塊圖。在本實施例中, 通訊系統200包括:處理模組210、通訊匯流排220與RS-485電路100,其中,RS-485電路100通過通訊匯流排220連接處理模組210。其中,資料輸入端111通過通訊匯流排220接收來自處理模組210的資料信號,資料輸出端114通過通訊匯流排220輸出另一資料信號至處理模組210;處理模組210可為但不限於微處理器、中央處理器或單晶片且基於資料信號的資料長度與鮑率產生所述計數值;通訊匯流排220可為但不限於通用異步接收發射器(UART)匯流排。Please refer to FIG. 2 , which is a block diagram of an embodiment of the communication system according to the present application. In this embodiment, the
因此,配置有本申請實施例的RS-485電路100或通訊系統200的多個電子裝置之間進行資料發送和接收時,傳輸資料的電子裝置的RS-485介面晶片110可因其資料輸入端111發生信號狀態轉換而切換為資料發送狀態,而接收資料的其他電子裝置的RS-485介面晶片110仍維持為資料接收狀態(因其資料輸入端111未發生信號狀態轉換而維持為預設狀態),使得該些電子裝置之間能順利完成資料的傳送與接收;而當傳輸資料的電子裝置完成資料的傳送時,即可基於其具有的計數器140到期而將其具有的RS-485介面晶片110切換為預設的資料接收狀態。Therefore, when data transmission and reception are performed between a plurality of electronic devices equipped with the RS-485
綜上所述,本申請實施例的RS-485電路可通過啟動偵測器、控制模組與計數器的設置,使得RS-485電路可由硬體方式自動判斷RS-485介面晶片的資料傳輸方向及傳輸時間,避免因資料尚未完全傳送完畢便將傳輸方向進行切換或者資料傳輸完畢卻未及時切換傳輸方向,而造成資料傳輸上的錯誤,也可解決現有技術中存在因需要在裝置的處理模組上增加額外的軟體代碼來實現狀態切換的控制,而造成增加軟體開發的工作量,浪費研發的人力資源的問題。To sum up, the RS-485 circuit of the embodiment of the present application can enable the setting of the detector, the control module and the counter, so that the RS-485 circuit can automatically determine the data transmission direction and the data transmission direction of the RS-485 interface chip by hardware. The transmission time can avoid switching the transmission direction because the data has not been completely transmitted, or the transmission direction is not switched in time after the data transmission is completed, which may cause errors in data transmission. Adding extra software code to realize the control of state switching, which increases the workload of software development and wastes the human resources of research and development.
雖然在本申請的圖式中包含了以上描述的組件,但不排除在不違反發明的精神下,使用更多其他的附加組件,已達成更佳的技術效果。Although the above-described components are included in the drawings of the present application, it is not excluded that more other additional components can be used to achieve better technical effects without violating the spirit of the invention.
雖然本發明使用以上實施例進行說明,但需要注意的是,這些描述並非用於限縮本發明。相反地,此發明涵蓋了所屬技術領域中的技術人員顯而易見的修改與相似設置。所以,申請專利範圍須以最寬廣的方式解釋來包含所有顯而易見的修改與相似設置。Although the present invention is described using the above embodiments, it should be noted that these descriptions are not intended to limit the present invention. On the contrary, this invention covers modifications and similar arrangements obvious to those skilled in the art. Therefore, the scope of the patent application is to be construed in the broadest possible manner to encompass all obvious modifications and similar arrangements.
50:RS-485匯流排
60:傳送邏輯單元
70:接收邏輯單元
100:RS-485電路
110:RS-485介面晶片
111:資料輸入端
112:致能端
113:差分信號收發端
113a,113b:差分信號引腳
114:資料輸出端
120:啟動偵測器
130:積體匯流排電路
140:計數器
142:暫存器
200:通訊系統
210:處理模組
220:通訊匯流排50: RS-485 bus bar
60: transmit logic unit
70: Receive logic unit
100: RS-485 circuit
110: RS-485 interface chip
111: Data input terminal
112: Enable end
113:
此處所說明的圖式用來提供對本申請的進一步理解,構成本申請的一部分,本申請的示意性實施例及其說明用於解釋本申請,並不構成對本申請的不當限定。在圖式中: 圖1為依據本申請的RS-485電路的一實施例方塊圖;以及 圖2為依據本申請的通訊系統的一實施例方塊圖。 The drawings described here are used to provide further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation of the application. In the schema: FIG. 1 is a block diagram of an embodiment of an RS-485 circuit according to the present application; and FIG. 2 is a block diagram of an embodiment of a communication system according to the present application.
50:RS-485匯流排 50: RS-485 bus bar
60:傳送邏輯單元 60: transmit logic unit
70:接收邏輯單元 70: Receive logic unit
100:RS-485電路 100: RS-485 circuit
110:RS-485介面晶片 110: RS-485 interface chip
111:資料輸入端 111: Data input terminal
112:致能端 112: Enable end
113:差分信號收發端 113: Differential signal transceiver
113a,113b:差分信號引腳 113a, 113b: Differential signal pins
114:資料輸出端 114: Data output terminal
120:啟動偵測器 120: Start the detector
130:積體匯流排電路 130: Integrated busbar circuit
140:計數器 140: Counter
142:暫存器 142: Scratchpad
Claims (10)
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US20150088450A1 (en) * | 2013-09-25 | 2015-03-26 | Dr. Johannes Heidenhain Gmbh | Position-measuring device and method for testing a clock signal |
US20150378346A1 (en) * | 2014-06-26 | 2015-12-31 | Dr. Johannes Heidenhain Gmbh | Device and method for generating a trigger signal in a position-measuring device and corresponding position-measuring device |
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US20150088450A1 (en) * | 2013-09-25 | 2015-03-26 | Dr. Johannes Heidenhain Gmbh | Position-measuring device and method for testing a clock signal |
US20150378346A1 (en) * | 2014-06-26 | 2015-12-31 | Dr. Johannes Heidenhain Gmbh | Device and method for generating a trigger signal in a position-measuring device and corresponding position-measuring device |
Non-Patent Citations (1)
Title |
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網路文獻 德州儀器 TL16C750E UART with 128-Byte FIFO 德州儀器 20191210 https://www.ti.com/lit/ds/symlink/tl16c750e.pdf?ts=1641349555602&ref_url=https%253A%252F%252Fwww.google.com%252F * |
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