Chapter 8 Communication Function
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①
Frame specification
z
Header
Used in [Header] type.
Possible characters, as headers are 1 alphabet letter, 1 numeric number, or control characters as below
Control character
Available Control Code
NUL(h00) STX(h02) ETX(h03) EOT(h04) ACK(h06) NAK(h15)
SOH(h01) ENQ(h05) BEL(h07) BS(h08) HT(h09) LF(h0A)
VT(h0B) FF(h0C) CR(h0D) SO(h0E) S1(h0F) DLE(h10)
DC1(h18) DC2(h12) DC3(h13) DC4(h14) SYN(h16) ETB(h17)
CAN(h18) EM(h19) SUB(h1A) ESC(h1B) FS(h1C) GS(h1D)
RS(h1E)
US(h1F)
Del(H7F)
Example 1) [NUL] , [ENQ] , [1] , [A] : Possible
Example 2) NUL, ENQ , [12] , [ABC] : impossible
-
It is allowed to be only 3 consecutive characters.
Example 1) [ENQ][STX][NUL] : Possible
Example 2) [A][NUL][ENQ][STX] : impossible
z
Send / Receiv
Not defined : It is the initial value that doesn’t declare a frame format.
Send : It is that declares send frame.
Receive : It is that declares receive frame.
When Frame 0 window is activated, Tx/Rx term is set as “Not defined,” and all the segments are not activated.
