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4-4SectionConnections
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When the response is longer than 131 characters, it will be divided into more
than one frame. A carriage return delimiter (↵, CHR$(13)) instead of a terminator
will automatically be set at the end of the frame. A terminator will be set at the end
of the last frame.
Item Function
@ An “@” symbol is placed at the beginning of every response.
Local Host
Link Node
No.
The PC’s Host Link node number set in DM 6553 or DM 6558 of
the PC Setup.
Header code The 2-character command code is returned.
End code The status of command execution is returned (normal end code).
Text The results of the command are returned.
FCS The 2-character Frame Check Sequence code is returned.
Terminator Two characters, “” and the carriage return (CHR$(13)) indicate the
end of the response.
An error response from the PC is returned in the format shown below. Prepare a
program at the host so that the response data can be interpreted and processed.
@
x 10
1
x 10
0
x 16
1
x 16
0
FCS
↵
Node No. Header
code
End code Terminator
The header code and text depend on the Host Link command that was received.
The end code indicates the completion status of the command (e.g., whether or
not an error has occurred).
Item Function
@ An “@” symbol is placed at the beginning of every response.
Local Host
Link Node
No.
The PC’s Host Link node number set in DM 6553 or DM 6558 of
the PC Setup.
Header code The 2-character command code is returned.
End code The status of command execution is returned (error code).
FCS The 2-character Frame Check Sequence code is returned.
Terminator Two characters, “” and the carriage return (CHR$(13)) indicate the
end of the response.
When a frame is transmitted, an FCS code is placed just before the delimiter or
terminator in order to check whether an error has occurred in the transmission.
The FCS is 8-bit data converted into two ASCII characters. The 8-bit data is the
result of an EXCLUSIVE OR performed on the data from the beginning of the
frame until the end of the text in that frame (i.e., just before the FCS). Calculating
the FCS each time a frame is received and checking the result against the FCS
Error Response Frame
Format
FCS (Frame Check
Sequence)