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When commands are issued to the host computer, the data is transmitted in one
direction from the PC to the host computer. If a response to a command is re-
quired use a host link communications command to write the response from the
host computer to the PC.
11-2 Command and Response Formats
This section explains the formats for the commands and responses that are ex-
changed in host link communications.
11-2-1 Commands from the Host Computer
When a command is issued from the host computer, the command and re-
sponse formats are as shown below.
Command Format When transmitting a command from the host computer, prepare the command
data in the format shown below.
x 10
1
@
FCS
x 10
0
: ↵
Node no. Header
code
Text Terminator
@
An “@” symbol must be placed at the beginning.
Node No.
Identifies the PC communicating with the host computer.
Specify the node number set for the PC in the PC Setup (DM 6648, DM 6653).
Header Code
Set the 2-character command code.
Text
Set the command parameters.
FCS
Set a 2-character Frame Check Sequence code. See page 405.
Terminator
Set two characters, “:” and the carriage return (CHR$(13)) to indicate the end
of the command.
Response Format The response from the PC is returned in the format shown below. Prepare a pro-
gram 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 Text Terminator
@, Node No., Header Code
Contents identical to those of the command are returned.
End Code
The completion status of the command (e.g., whether or not an error has oc-
curred) is returned.
Text
Text is returned only when there is data such as read data.
FCS, Terminator
Refer to the corresponding explanations under “Command Format”.
Command and Response Formats
Section 11-2