GB869396A - Improvements in or relating to electrical remote supervisory apparatus - Google Patents
Improvements in or relating to electrical remote supervisory apparatusInfo
- Publication number
- GB869396A GB869396A GB20196/59A GB2019659A GB869396A GB 869396 A GB869396 A GB 869396A GB 20196/59 A GB20196/59 A GB 20196/59A GB 2019659 A GB2019659 A GB 2019659A GB 869396 A GB869396 A GB 869396A
- Authority
- GB
- United Kingdom
- Prior art keywords
- field station
- station
- relay
- pulses
- pulse
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Selective Calling Equipment (AREA)
Abstract
869,396. Electric selective signalling systems. COMPAGNIE DES COMPTEURS. June 12, 1959 [June 16, 1958], No. 20196/59. Class 40(1). In a field station system in order to preven a field station transmitting data incorrectly to the central station each field station is called by two pulses, the first of which prepares or " readies " a field station to transmit if it has received a complete unit of data and the second of which actually causes the field station to transmit if it has been " readied." As a further safeguard these two pulses are followed by a third pulse which resets a " readied " field station, thereby ensuring that a field station can only be caused to transmit data by a pulse occurring at the correct time. As described, the central station I, Fig. 1, calls field stations, only one, II, being shown, successively by means of a rotary switch 22 and these calling pulses constitute the first pulses mentioned above. If a field station is prepared to be readied (i.e. if it has received a complete unit of data, this being represented by the positions of two switches 6 and 12) then a contact 5 is closed (by means not described) and the first call pulse from switch 22 energizes a relay 1 which is rendered slow-to-release by a capacitor 3. When relay 1 is energized the field station is " readied." The second pulse transmitted by the central station actually consists, as shown, of two pulses produced by switches 19 and 20 which make at least one revolution for each position of switch 22. These two pulses result in the energization of one of six coils 50 depending upon the positions of switches 6 and 12, the circuit being via a winding of a relay 8 and a contact 2 held closed by relay 1. Relay 8 causes a record of the data (i.e. the positions of switches 6 and 12) to be made at the field station. The third pulse produced by the central station is a pulse of earth and is transmitted by switch 22 to make relay 1 drop-out. After this switch 22 advances to its next contact and a further field station is interrogated.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR869396X | 1958-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB869396A true GB869396A (en) | 1961-05-31 |
Family
ID=9346476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20196/59A Expired GB869396A (en) | 1958-06-16 | 1959-06-12 | Improvements in or relating to electrical remote supervisory apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB869396A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4422148A (en) | 1979-10-30 | 1983-12-20 | Pitney Bowes Inc. | Electronic postage meter having plural computing systems |
| US4498187A (en) * | 1979-10-30 | 1985-02-05 | Pitney Bowes Inc. | Electronic postage meter having plural computing systems |
-
1959
- 1959-06-12 GB GB20196/59A patent/GB869396A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4422148A (en) | 1979-10-30 | 1983-12-20 | Pitney Bowes Inc. | Electronic postage meter having plural computing systems |
| US4498187A (en) * | 1979-10-30 | 1985-02-05 | Pitney Bowes Inc. | Electronic postage meter having plural computing systems |
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