PCL5 command or sample code To print text in gray color

Hi all,

 I have a requirement to print PCL5 text in gray color. I have tried the pcl command Esc*c#G ( # % Grey Scale) , with different values icluding 37%,  but still text is coming in black color.

Please find below the code which i tried

 Esc*c37GEsc*v4TTest

Could you please provide a sample pcl code to print a word, "Test" in grey color.

Thanks in advance