Parameter 20 - Echo Mask

Parameter 20 is bit-mapped and defines the set of characters that are excluded from the echo function. Characters specified by bit value 64 are masked only when editing is active.

Parameter 20 supports the following values:

Values    Description                                                

64        All characters, except editing characters, are echoed      

          (factory setting)                                           

0-255     Sum of bits selecting characters to be echoed

Parameter 20 supports the following bit values:

Bit Values   Description                                              

1            CR                                                       

2            LF                                                       

4            VT, HT, FF                                               

8            BEL, BS                                                  

16           ESC, ENQ                                                 

32           ACK, NAK, STX, SOH, EOT, ETB, ETX                        

64           Parameters 16, 17, 18 (editing characters)               

128          NUL, SO, SI, DLE, DC1, DC2, DC3, DC4, SYN,               

             CAN, EM, SUB, FS, GS, RS, US

Note: Adding bit values provides multiple functionality, e.g., Set 20:17 would enter bits 1 and 16. Bits 1 and 16 support CR, ESC, and ENQ.

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