CN202906949U - RS485 double host machine communication passthrough module - Google Patents
RS485 double host machine communication passthrough module Download PDFInfo
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- CN202906949U CN202906949U CN 201220618990 CN201220618990U CN202906949U CN 202906949 U CN202906949 U CN 202906949U CN 201220618990 CN201220618990 CN 201220618990 CN 201220618990 U CN201220618990 U CN 201220618990U CN 202906949 U CN202906949 U CN 202906949U
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Abstract
The utility model relates to an RS485 double host machine communication passthrough module, comprising a central processor. The RS485 double host machine communication passthrough module is characterized in that the central processor comprises a serial port A, a serial port B, and a serial port C. The serial port A is connected with an input end of a first signal isolator. An output end of the first signal isolator is connected with a USB converter and an RS232 converter. The serial port B is connected with an input end of a second signal isolator. An output end of the second signal isolator is connected with a first RS485 converter. The serial port C is connected with an input end of a third signal isolator. An output end of the third signal isolator is connected with a second RS485 converter. The RS485 double host machine communication passthrough module is suitable to be used in situations that an original communication monitoring system need to add monitoring points, and is also suitable to be used in situations a general single host machine system requires communication protection or signal isolation.
Description
Technical field
The utility model relates to the two host communication transparent transmission modules in two host computer control fields, particularly a kind of RS485.
Background technology
In the RS485 communication system, generally connect multiple devices by a main frame and carry out communication, all communication dispatch orders are initiated by main frame, and the equipment that equipment end receives the rear matching addresses of order returns response message, and 1 main frame can only be arranged in the system.When having 2 main frames to connect simultaneously each equipment in the system, because two main frames transmit a signal on the communication bus simultaneously, can cause data to make mistakes, can't finish communication.
The utility model content
In view of this, the purpose of this utility model provides the two host communication transparent transmission modules of a kind of RS485, the data that occur when being used for the solving two host computer control problem of makeing mistakes.
The utility model adopts following scheme to realize: the two host communication transparent transmission modules of a kind of RS485, comprise a central processing unit, and it is characterized in that: described central processing unit comprises a serial ports A, a serial ports B and a serial ports C; Described serial ports A connects the input of a first signal isolator; The output of described first signal isolator connects a USB transducer and a RS232 transducer; Described serial ports B connects the input of a secondary signal isolator; The output of described secondary signal isolator connects one the one RS485 transducer; Described serial ports C connects the input of one the 3rd signal isolator; The output of described the 3rd signal isolator connects one the 2nd RS485 transducer.
In the utility model one embodiment, described central processing unit also comprises a bus arbiter unit, an intelligent transparent transmission unit, a data buffer storage unit, communication verification unit and an exception processing unit; Described bus arbiter unit connects described intelligent transparent transmission unit, and described intelligent transparent transmission unit connects described data buffer storage unit, and described data buffer storage unit connects described communication verification unit, and described communication verification unit connects described exception processing unit; Described communication verification unit also connects described serial ports A, described serial ports B and described serial ports C.
In the utility model one embodiment, also comprise a power supply changeover device, be used to the two host communication transparent transmission module for power supply of described RS485.
In the utility model one embodiment, described USB transducer or described RS232 transducer connect one first main frame; A described RS485 transducer connects one second main frame; Described the 2nd RS485 transducer connects an equipment end.
In the utility model one embodiment, the kernel of described central processing unit is Cortex-M3.
In the utility model one embodiment, the model of described first signal isolator is ISO7221, and the model of described secondary signal isolator is IOS7242, and the model of described the 3rd signal isolator is IOS7242.
In the utility model one embodiment, the model of described USB transducer is PL2303HX, the model of described RS232 transducer is MAX202 or MAX232, and the model of a described RS485 transducer is MAX485, and the model of described the 2nd RS485 transducer is MAX485.
The utility model is applicable to need to increase in the former Communication Monitor System situation of monitor node, also is applicable to require in the general purpose single host computer system situation with communication protection or signal isolation.
Description of drawings
Fig. 1 is the circuit diagram of the two host communication transparent transmission modules of a kind of RS485 of the utility model.
Fig. 2 is the circuit diagram of two host communication transparent transmission module one specific embodiments of a kind of RS485 of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below will by specific embodiment and relevant drawings, the utility model be described in further detail.
The utility model provides the two host communication transparent transmission modules of a kind of RS485, comprises a central processing unit, and it is characterized in that: described central processing unit comprises a serial ports A, a serial ports B and a serial ports C; Described serial ports A connects the input of a first signal isolator; The output of described first signal isolator connects a USB transducer and a RS232 transducer; Described serial ports B connects the input of a secondary signal isolator; The output of described secondary signal isolator connects one the one RS485 transducer; Described serial ports C connects the input of one the 3rd signal isolator; The output of described the 3rd signal isolator connects one the 2nd RS485 transducer.
As shown in Figure 1, present embodiment provides the two host communication transparent transmission modules of a kind of RS485, comprises a central processing unit 1, and it is characterized in that: described central processing unit 1 comprises a serial ports A, a serial ports B and a serial ports C; Described serial ports A connects the input of a first signal isolator 2; The output of described first signal isolator 2 connects a USB transducer 3 and a RS232 transducer 4; Described serial ports B connects the input of a secondary signal isolator 5; The output of described secondary signal isolator 5 connects one the one RS485 transducer 6; Described serial ports C connects the input of one the 3rd signal isolator 7; The output of described the 3rd signal isolator 7 connects one the 2nd RS485 transducer 8.Described central processing unit 1 also comprises a bus arbiter unit, an intelligent transparent transmission unit, a data buffer storage unit, communication verification unit and an exception processing unit; Described bus arbiter unit connects described intelligent transparent transmission unit, and described intelligent transparent transmission unit connects described data buffer storage unit, and described data buffer storage unit connects described communication verification unit, and described communication verification unit connects described exception processing unit; Described communication verification unit also connects described serial ports A, described serial ports B and described serial ports C.
As shown in Figure 2, present embodiment provides the two host communication transparent transmission modules of a kind of RS485, comprises a central processing unit, and it is characterized in that: described central processing unit comprises a serial ports A, a serial ports B and a serial ports C; Described serial ports A connects the input of a first signal isolator; The output of described first signal isolator connects a USB transducer and a RS232 transducer; Described serial ports B connects the input of a secondary signal isolator; The output of described secondary signal isolator connects one the one RS485 transducer; Described serial ports C connects the input of one the 3rd signal isolator; The output of described the 3rd signal isolator connects one the 2nd RS485 transducer.Described central processing unit also comprises a bus arbiter unit, an intelligent transparent transmission unit, a data buffer storage unit, communication verification unit and an exception processing unit; Described bus arbiter unit connects described intelligent transparent transmission unit, and described intelligent transparent transmission unit connects described data buffer storage unit, and described data buffer storage unit connects described communication verification unit, and described communication verification unit connects described exception processing unit; Described communication verification unit also connects described serial ports A, described serial ports B and described serial ports C.Also comprise a power supply changeover device, be used to the two host communication transparent transmission module for power supply of described RS485.Described USB transducer or described RS232 transducer connect one first main frame; A described RS485 transducer connects one second main frame; Described the 2nd RS485 transducer connects an equipment end.Described central processing unit kernel is for being Cortex-M3.The model of described first signal isolator is ISO7221, and the model of described secondary signal isolator is IOS7242, and the model of described the 3rd signal isolator is IOS7242.The model of described USB transducer is PL2303HX, and the model of described RS232 transducer is MAX202 or MAX232, and the model of a described RS485 transducer is MAX485, and the model of described the 2nd RS485 transducer is MAX485.
In order to allow those skilled in the art understand better technical characterstic of the present utility model, below in conjunction with hardware structure of the present utility model its operation principle is described.
The utility model adopts modularized design, adopt the Cortex-M3 chip of supporting 3 communication port communications as central processor CPU, be connected with 2 main frames and each equipment, equipment end and the second main frame are the RS485 communication port, and the first main frame is RS232 mouth or USB mouth.After the CPU of the two host communication transparent transmission modules of described RS485 receives main frame transmission message, arbitrate the communication port line which main frame takies equipment end according to sequencing, there is the main frame message of the authority of taking to be addressed to equipment end, keeps in without received being kept in the CPU internal memory of the main frame message that takies authority.After equipment reception message is replied, returned packet is to module CPU, be transmitted to corresponding main frame by CPU, when continuous 5 character transmission do not receive the message data of equipment end in the time again, think that the equipment end message sends end, the release device communication bus, changeable another main frame of giving of device talk bus this moment carries out communication.The main frame message is issued equipment end and is not received response message after 3 seconds always in addition, also automatic release device communication bus.
The utility model is applicable to need to increase in the former Communication Monitor System situation of monitor node, also is applicable to require in the general purpose single host computer system situation with communication protection or signal isolation.
Above-listed preferred embodiment; the purpose of this utility model, technical scheme and advantage are further described; institute is understood that; the above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. the two host communication transparent transmission modules of RS485 comprise a central processing unit, and it is characterized in that: described central processing unit comprises a serial ports A, a serial ports B and a serial ports C; Described serial ports A connects the input of a first signal isolator; The output of described first signal isolator connects a USB transducer and a RS232 transducer; Described serial ports B connects the input of a secondary signal isolator; The output of described secondary signal isolator connects one the one RS485 transducer; Described serial ports C connects the input of one the 3rd signal isolator; The output of described the 3rd signal isolator connects one the 2nd RS485 transducer.
2. two host communication transparent transmission modules of a kind of RS485 according to claim 1, it is characterized in that: described central processing unit also comprises a bus arbiter unit, an intelligent transparent transmission unit, a data buffer storage unit, communication verification unit and an exception processing unit; Described communication verification unit connects described serial ports A, described serial ports B and described serial ports C.
3. the two host communication transparent transmission modules of a kind of RS485 according to claim 1 is characterized in that: also comprise a power supply changeover device, be used to the two host communication transparent transmission module for power supply of described RS485.
4. two host communication transparent transmission modules of a kind of RS485 according to claim 1, it is characterized in that: described USB transducer or described RS232 transducer connect one first main frame; A described RS485 transducer connects one second main frame; Described the 2nd RS485 transducer connects an equipment end.
5. two host communication transparent transmission modules of a kind of RS485 according to claim 1, it is characterized in that: the kernel of described central processing unit is Cortex-M3.
6. two host communication transparent transmission modules of a kind of RS485 according to claim 1, it is characterized in that: the model of described first signal isolator is ISO7221, the model of described secondary signal isolator is IOS7242, and the model of described the 3rd signal isolator is IOS7242.
7. two host communication transparent transmission modules of a kind of RS485 according to claim 1, it is characterized in that: the model of described USB transducer is PL2303HX, the model of described RS232 transducer is MAX202 or MAX232, the model of a described RS485 transducer is MAX485, and the model of described the 2nd RS485 transducer is MAX485.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220618990 CN202906949U (en) | 2012-11-21 | 2012-11-21 | RS485 double host machine communication passthrough module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220618990 CN202906949U (en) | 2012-11-21 | 2012-11-21 | RS485 double host machine communication passthrough module |
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| CN202906949U true CN202906949U (en) | 2013-04-24 |
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| CN 201220618990 Expired - Lifetime CN202906949U (en) | 2012-11-21 | 2012-11-21 | RS485 double host machine communication passthrough module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107896152A (en) * | 2017-12-28 | 2018-04-10 | 黑龙江龙电电气有限公司 | Multi-channel communication sharing device and method |
| WO2019179384A1 (en) * | 2018-03-22 | 2019-09-26 | 华为技术有限公司 | Communication method and related device |
-
2012
- 2012-11-21 CN CN 201220618990 patent/CN202906949U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107896152A (en) * | 2017-12-28 | 2018-04-10 | 黑龙江龙电电气有限公司 | Multi-channel communication sharing device and method |
| WO2019179384A1 (en) * | 2018-03-22 | 2019-09-26 | 华为技术有限公司 | Communication method and related device |
| CN110300040A (en) * | 2018-03-22 | 2019-10-01 | 华为技术有限公司 | A kind of communication means and relevant device |
| CN110300040B (en) * | 2018-03-22 | 2021-10-01 | 华为技术有限公司 | Communication method and related equipment |
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Granted publication date: 20130424 |
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| CX01 | Expiry of patent term |