U204-A Keypad

U204-A Keypad

Features:

Adopt ITO material, water-proof design

Oil-proof,ultraviolet-ray-proof

Running normally on the condition of -40to+55degree

Gilding bottons shrapnel

Weight:230g

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-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 dispensers adopt matrix or color liquid crystal display, sh fuel dispenser owing 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 co fuel dispenser nverter, 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

.................................... 40　　5 IMPLEMENTATION GUIDELINES RECOMMENDATIONS ......................................... 41　　5.1 ACTIONS WHEN A DEVICE RECOGNISES THAT A SC IS OFF-LINE................................................. 41　　5.2 IFSF MESSAGE EXAMPLES ............................................................................................... 41　　 5.2.1 Read and Answer Messages ....................................................................................... 41　　 5.2.2 Write and Acknowledge Messages .............................................................................. 41　　5.3 READ AND WRITE DATA ERROR HANDLING .......................................................................... 42　　 5.3.1 Communication Layer Errors ...................................................................................... 42　　 5.3.2 Application Data Layer Errors ..................................................................................... 43　　5.4 DATA_ACK ERROR HANDLING .......................................................................................... 44　　 5.4.1 Checking Order ............................... fuel dispenser .......................................................................... 45　　FP2_1.90 IFSF STANDARD FORECOURT PROTOCOL February 2006　　 COMMUNICATION SPECIFICATION　　Page: 4　　0 Record of Changes　　 fuel dispenser Only changes effected in Versions1.83 1.84 and 1.85 are listed. Previous changes can　　 be viewed in previous versions available in the Library Standards Archive Section.　　 Date Versio Modification　　 n　　 October 1.83 Various formatting modification throughout the document　　 2002 fuel dispenser

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