TOHO ELECTRONICS TTM000 - Manual (Page 8)

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3. TOHO communications control
3.1 Communications procedure
This product returns a "response message" in response to a "request message" from a high-level
computer. It therefore does not initiate a transmission.
3.2 Message types
Messages are roughly divided into the following types:
Read request message
Write request message
Store request message
Request message (transmitted
from a high-level computer)
Response message (transmitted
from this product)
Receipt acknowledgement and data
response
Write complete response
Reception error and error description
response
Store complete response
: Response when a normal "request message" is received
: When a received "request message" contains an error
All codes (except for BCC) from STX and data to ETX are expressed in ASCII codes.
In assembling a program for a high-level computer, see "9. Table of identifiers (codes)" and "10.
Table of ASCII codes" at the end of the book.