U212-A Rolling Display

U212-A Rolling Display

Features:

Power : AC220V , 50Hz

Including : 2 displays , 1 power board , 1 transformer , 1 SSR

The content on the display could be changeable

Easily fixed on fuel dispenser

100% Factory Tested

ariable DC voltage. Diagram 3-9 is a drive circuit. The display mode of volume and sales on main display board adopt 6 digits liquid crystal display (Model ED-139, see Diagram 3-11), PPU or unit price r digits LCD (Model ED-830, see Diagram 3-12). Diagram 3-9: Static circuit and wave of LCD tube Diagram 3-10: Drive circuit of one-digit tube Diagram 3-11: ED-139 6-digit LCD Diagram 3-12: ED- fuel dispenser 830 4-digit LCD Display drive chip often adopts 8-digit memory/flip-latch: 74HC95. The drive circuit of liquid crystal display is composed of double D trigger 74HC74 and double input exclusive-OR gate 74HC86. Some fuel dispensers adopt special crystal drive circuit in liquid crystal display, its principle basically similar to 74 series LCD drive circuit. A few fuel dispenser manufacturers adopt light-emitting diode (LED) as display components of display board because its cost is low and need not backlight in evening. The defect of this display component is bad display effect, especially under extensive sunlight, and much electricity consumption. LED display drive circuit also has parallel and serial drive, similar to LCD display drive circuit in terms of structure. Very few fuel d fuel dispenser ispensers adopt matrix or color liquid crystal display, showing much information. However, it largely increases cost. 2.4 Power supply Stable voltage power supply used in explosion-proof fuel dispenser Most of fuel dispensers adopt explosion-proof type, installing liner stable voltage power supply or switch voltage power supply. Switch voltage stabilizing power supply includes power transformer, DC/DC converter, 220V direct commute and pulse transformer, illustrated in Diagram 3-14 and 3-15. Due to cost-efficient and simple design, liner stable voltage power is widely adopted. However, it is affected by exterior network voltage. Although pulse transformer is able to tackle with network voltage fluctuation, it is can’t afford because of complicated technology, expensive cost and difficult to maintenance. In recent years, D fuel dispenser

ne transaction at a time the PCD will have　　 to manage multiple transaction itself (assuming that the PCD supports more than 1　　 transaction buffer).　　 As most proprietary FP s don t support assignment the PCD will have to manage　　 the assignment regulations itself.　　 As most proprietary fuel dispenser FP s don t support pre-authorization the PCD will have to　　 manage the pre-authorization itself (e.g. be in a state where it will automatically　　 release the proprietary FP when the customer removes the nozzle).　　 It is also possible to pre-authorise a FP locally by a sales assistant (on attendant　　 operated FPs).　　 Action: For preset or prepay mode the FP receives the Remote_Volume_Preset　　 or Remote_Amount_Prepay data. The FP receives　　 Release_FP command.　　 Action : The FP state change is send as an unsolicited data array　　 fuel dispenser FP_Status_Message .　　June 2005 IFSF - STANDARD FORECOURT PROTOCOL FP31_2.21　　 DISPENSER APPLICATION　　 Page: 35　　 CLOSE_FP The FP will be closed down and the FP moves into the CLOSED state.　　 This may be used to temporarily shut down one or more FP s when business is　　 slack.　　 PCD Comment:　　 Where possible the PCD must utilises proprietary FP protocol features that　　 indicate that the FP is not available to the customer (e.g. switching display lights　　 fuel dispenser

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