JPH03207196A - Transmitter - Google Patents

Abstract

PURPOSE:To make a data communication with external equipment which differ in signal specification by preparing option parts which has converting functions corresponding to plural different kinds of signal specification. CONSTITUTION:An option part 20 and external equipment are connected by a field bus 30 and the electric specification is matched by a driver circuit 24 which includes the field bus 30. Further, the protocol conversion of data inputted from the external equipment to the option part 20 is performed according to a protocol conversion program stored in a ROM 25 and the converted data is sent to a CPU 11 through a driver 23, a photodiode PD2, a phototransistor PT1, and an I/O part 13. The protocol conversion of data outputted from a main body part 10 to the external equipment is performed in the reverse direction. Consequently, the data communication with the external equipment differing in signal specification can be performed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transmitter that converts a detection signal input from a sensor into a predetermined measurement signal and sends it to the outside. This invention relates to a transmitter that can send and receive signals.

[Prior Art] Conventionally, data communication between a transmitter and an external device is based on specifications established by the transmitter manufacturer. [Problems to be Solved by the Invention] The above-mentioned conventional transmitters had a drawback in that they could not perform data communication with external devices using fieldbus or communication protocols of different standards than the predetermined specifications. [A thousand steps to solve the problem] The transmitter of the present invention includes a main unit that converts a detection signal input from a sensor into a predetermined measurement signal and outputs it, and an optional unit that exchanges data with the main unit. The optional part is detachably attached to the main body, and transmits and receives signals to and from the main body according to the first signal specification, and also transmits and receives signals to the outside according to the second signal specification, thereby achieving the first signal specification. and a second signal specification.

[Operation Co. The conversion means of the option section connected to the main body section converts the signal specifications for data communication between the main body section and external equipment. Therefore, by preparing an opsigon section having a conversion function according to a plurality of different signal specifications, it is possible to perform data communication with external devices each having a different signal specification.

[Example] Next, the present invention will be explained with reference to the drawings.

The figure is a block diagram showing one embodiment of the transmitter of the present invention.The main body 10 provides the functions of a normal transmitter, and the CPU 1 on the main body side performs data processing and control operations of each part. It is set to run. 12 connects the signal input from CPUI 1 to the photodiode PD
Driver 13 is a phototransistor PT that sends data to I
This is an I/O section that sends signals manually input from I to CPU II. Further, the main body section 10 is configured to operate with a power supply supplied from the outside, for example, 24V DC. on the other hand,
The option unit 20 provides a signal specification conversion function, and the CPU 21 on the option side realizes the above function. 22 is an I/O that sends a signal input from the phototransistor PT2 to the CPU 21
23 is a driver that sends a signal input from the CPU 21 to the photodiode PD2; 25 is a protocol conversion program for executing signal specification conversion operations; and RO for storing data necessary for protocol conversion.
M, 26 is a RAM. 24 is a driver circuit that exchanges data with an external device (not shown) via the field bus 30, and also exchanges this data with the CPU 21.

Note that the driver circuit 24 includes a bus driver and a path receiver that conform to the signal specifications of the field bus 30.

Further, the option section 20 has a battery power source (not shown), and the option section 20 is operated by this power source.

Moreover, the main body part 10 and the option part 20 have a detachable structure, and when installed, the phototransistors PTI, PT2 and the photodiodes PDI,
Signals are sent and received through a photocoupler-style interface configured by PD2. Next, the operation of data communication performed with an external device by the transmitter configured as described above will be explained.

As described above, data communication is performed between the main body section 10 and the option section 20 using a photocoupler format, and this data communication is performed using a predetermined protocol. On the other hand, the option unit 20 and an external device (not shown) are connected by a field bus 30, and a driver circuit 24 that accommodates the field bus 30 controls electrical specifications such as voltage, current, input resistance, and output resistance. Consistency is maintained. In addition, the CPU 21 performs protocol conversion of data input from an external device to the option section 20 in the ROM 2.
5, and at that time, the ROM 25 and RA
M26 is used, and the data converted into the predetermined protocol by the CPU 21 is sent to the driver 23, photodiode PD2, phototransistor PT1, and I
The data is transmitted to the CPU II via the /O section 13. On the other hand, protocol conversion of data output from the main unit 10 to an external device is performed in the opposite direction to the above case. CPU 1
The data output from the driver 12, photodiode PDI, phototransistor PT2, and I/O
The signal is inputted to the CPU 21 via the unit 22, and after being subjected to protocol conversion according to the protocol of the external device, contrary to the case described above, is transmitted to the external device connected to the field bus 30 via the driver 24.

In the above-mentioned embodiment, it is assumed that digital data communication is to be performed with the external device, but the invention is not limited to this, and if the driver circuit is capable of outputting analog signals, the field bus It is also possible to use an analog bus (4-20 mA).

In addition, if the electrical standard of the fieldbus is the same and only the protocol is different, the optional section 20 is provided with a protocol selection means consisting of a dip switch, etc., and the protocol conversion is performed according to the setting state of this dip switch. If configured to do so, it is possible to select a plurality of protocol conversions simply by changing a dip switch.

[Effects of the Invention] As explained above, according to the transmitter of the present invention, the signal specifications of data communication performed between the main body and external equipment can be converted by the conversion means of the optional part connected to the main body. will be done. Therefore, by preparing an opsigon section having a conversion function according to a plurality of different signal specifications, it is possible to perform data communication with external devices each having a different signal specification. This has the advantage that the transmitter can be used in a communication network that differs from the signal specifications of the transmitter.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the transmitter of this invention. 10...Main unit, 20...Optional unit. tsu

Claims (1)

[Scope of Claims] A transmitter comprising a main body that converts a detection signal input from a sensor into a predetermined measurement signal and sends it out, and an optional part that sends and receives signals to and from the main body, the transmitter comprising: The option part is provided to be detachably attached to the main body part,
A signal specification is established between the first signal specification and the second signal specification by exchanging signals with the main body according to the first signal specification and exchanging signals with the outside according to the second signal specification. An oscillator characterized in that it has a conversion means for converting.