JPS61149444U - - Google Patents
Info
- Publication number
- JPS61149444U JPS61149444U JP3276285U JP3276285U JPS61149444U JP S61149444 U JPS61149444 U JP S61149444U JP 3276285 U JP3276285 U JP 3276285U JP 3276285 U JP3276285 U JP 3276285U JP S61149444 U JPS61149444 U JP S61149444U
- Authority
- JP
- Japan
- Prior art keywords
- current
- constant
- current loop
- loop
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Information Transfer Systems (AREA)
- Dc Digital Transmission (AREA)
Description
第１図は本考案による電流ループ式インタフエ
ース装置の一実施例を示すブロツク図、第２図は
従来例を示すブロツク図である。
１１：電流ループ、２，７：定電流源回路、５
：電流スイツチ、３：定抵抗、１３：定電流判定
回路、１２：切替回路、１０：電流極性検出回路
。
FIG. 1 is a block diagram showing one embodiment of a current loop type interface device according to the present invention, and FIG. 2 is a block diagram showing a conventional example. 11: Current loop, 2, 7: Constant current source circuit, 5
: current switch, 3: constant resistance, 13: constant current determination circuit, 12: switching circuit, 10: current polarity detection circuit.
Claims (1)
した電流が前記電流ループに流れるようにスイツ
チングを行なう電流スイツチと、 送信側にあつて、前記電流ループに流れている
電流の極性を判別して対応する電圧に変換する電
流極性検出回路と、 送信側および受信側にあつて、前記電流ループ
に対して互いに並列に接続された定電流源回路と
定抵抗と、 前記定電流源回路と前記定抵抗を前記電流ルー
プに切替接続する切替回路と、 前記電流ループに流れる電流の安定度を判定し
て前記切替回路を制御する定電流判定回路を備え
たことを特徴とする電流ループ式インタフエース
装置。[Claims for Utility Model Registration] A current loop, a current switch on the receiving side that performs switching so that a current corresponding to the voltage of an external transmission signal flows through the current loop, and on the transmitting side, the above-mentioned current switch. A current polarity detection circuit that determines the polarity of the current flowing in the current loop and converts it into a corresponding voltage; and a constant current source circuit that is connected in parallel to the current loop on the transmitting and receiving sides. and a constant resistor; a switching circuit that switches and connects the constant current source circuit and the constant resistor to the current loop; and a constant current determination circuit that determines the stability of the current flowing in the current loop and controls the switching circuit. A current loop type interface device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3276285U JPS61149444U (en) | 1985-03-07 | 1985-03-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3276285U JPS61149444U (en) | 1985-03-07 | 1985-03-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61149444U true JPS61149444U (en) | 1986-09-16 |
Family
ID=30534579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3276285U Pending JPS61149444U (en) | 1985-03-07 | 1985-03-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61149444U (en) |
-
1985
- 1985-03-07 JP JP3276285U patent/JPS61149444U/ja active Pending