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LY4型数字打印机性能稳定应用范围广,但是它所需输入信息的电平较高(正逻辑,其“1”电平为+6伏～+12伏,“0”电平为+1伏,～—12伏)。TTL电路的输出电平比较低(V_(oH)≥2.4伏,V_(oL)≤+0.4伏),所以不能满足LY4打印机的电平要求。实现二者之间的配接通常采用提升电平的方法,但是这种方法将增加许多元器件以及信息的传递环节,造成了可靠性降低。下面介绍一种改变LY4打印机内一个电阻的阻值,就可实现上述联机动能的简单方法。实践表明,这种方法简便易行、工作可靠并且可不增加任何元器件及工作环节。图1是LY4打印符合打印单元中有关信息转换部分的线路。图中只画出了每位四个信息“1”,“2”
The LY4 digital printer has stable performance and a wide range of applications, but it requires a high level of input information (positive logic, with a “1” level of +6 volts to +12 volts and a “0” level of +1 volt, ~ -12 volts). TTL circuit output level is relatively low (V_ (oH) ≥ 2.4 volts, V_ (oL) ≤ + 0.4 volts), so can not meet the LY4 printer level requirements. To achieve the connection between the two usually use the method of raising the level, but this method will increase the transmission of many components and information, resulting in reduced reliability. The following describes a change in LY4 printer resistance of a resistor, you can achieve the above online kinetic energy of a simple method. Practice shows that this method is simple, reliable and without adding any components and work processes. Figure 1 shows the line printed by LY4 in line with the information conversion section of the printing unit. The figure shows only four messages for each “1”, “2”