COMPANY INTRODUCE

COMPANY INTRODUCE

China Hongyang Group, is an integrated enterprise with the research & development, production and marketing of Fuel Dispenser and related accessories as well as service station concerning equipments. It concentrates on the relative manufacture & services of filling station such as Hongyang tax control Fuel dispenser, IC Card fuel dispenser, manage system of network for stations, submerge pump and liquid level devise. China Hongyang Group, designed supplier of SinoPec and PetrolChina, our HONGYANG products have been sold to over 50 countries in South-east Asia, Mid-east, Africa, Europe and well received in their markets.

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- fuel dispenser 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, showing much information. However, it largely increases cost. 2.4 Power supply Stable voltage power supply used in explo fuel dispenser sion-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

ignored and no response is expected.　　 8 NAK Message unexpected. This NAK acknowledges an unsolicited　　 mes fuel dispenser sage with Acknowledge. This permits the clear rejection of the　　 entire message.　　FP2_1.90 IFSF STANDARD FORECOURT PROTOCOL February 2006　　 COMMUNICATION SPECIFICATION　　Page: 22　　 9 NAK Device already locked. This NAK is sent by a device in response to　　 other devices attempting to communicate with them while they are　　 being configured.　　Table 2 Data Acknowledge Status　　 Checking Order Description　　 Data_Ack　　 0 ACK Positive acknowledge: data acceptable　　 1 3 (Write) NAK Invalid value (too big too small)　　 2 2 (Write) NAK Not Writable　　 - in that state (or any stat fuel dispenser e)　　 - read only data　　 3 1 (Command) NAK Command refused in that state　　 4 1 (Write) NAK Data does not exist in this device　　 5 2 (Command) NAK Command not understood implemented　　 6 3 (Command) NAK Command not accepted. Valid State and　　 valid Command but application rej fuel dispenser

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