打印条形码
条形码在各个行业中现在有广泛的应用，所以让打印机打印条形码是非常重要的功能，不过你不需要费好多精力去研究条形码知识，因为爱普生指令中有一个打印条形码指令，例如我们要打印条形码“ 091955826335 ”，只要使用如下命令即可。
socketWriter.write(0x1d);
socketWriter.write(0x68);
socketWriter.write(120);
socketWriter.write(0x1d);
socketWriter.write(0x48);
socketWriter.write(0x01);
socketWriter.write(0x1d);
socketWriter.write(0x6B);
socketWriter.write(0x02);
socketWriter.println "091955826335" );
socketWriter.write(0x00);
socketWriter.write(0x68);
socketWriter.write(120);
socketWriter.write(0x1d);
socketWriter.write(0x48);
socketWriter.write(0x01);
socketWriter.write(0x1d);
socketWriter.write(0x6B);
socketWriter.write(0x02);
socketWriter.println "091955826335" );
socketWriter.write(0x00);
