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=> ACK - if data is received correctly, or
NAK - if an error has occurred
* The host sends a command to and receives a response from
the terminal in one poll cycle; it then acknowledges receipt of
the terminal command response:
=> STX, CMD, parms, ... CS1, CS2, ADDR
<= ACK - if data is received correctly and no response is
required, or
NAK - if an error occurred or if there is response data
to be sent.
<= Command response and data:
=> ACK - if a command response was sent from the
terminal and received correctly by the host, or
NAK - if an error occurred in the command response
4.4.2. Commands
The following commands are supported for download, diagnostic,
and application data transfers. Each command and its parameters
will be framed as shown before being transmitted; responses have the
same format without the ADDR fields.
STX, CMD, parms, ... CS1, CS2, ADDR
ESC 0 - Application data
=> STX ESC 0 <data> CS1 CS2 ADDR
<= ACK or NAK
Since the MR350MKII has only one frame to hold the single
incoming application data, and the frame will not become
available until the holding data is retrieved by terminal?
application program. Therefore, it is important to check the
terminal echo back status whether ACK or NAK to sure the
terminal has received the data.