TOHO ELECTRONICS TTM-10L - Manual (Page 6)

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3. 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.
High-level computer
This product (TTM-10L)
Request message
Response message
Request message
Response message
Transmitted by a high-
level computer
Transmitted by
TTM-10L
Transmitted by a high-
level computer
Transmitted by
TTM-10L
1ms or more
Response delay time
0-250ms
See "2.9 Setting a response delay time."
See "3.6.1 Communications timing." See "3.6.2 Interval between requests."
3.2 Message types
n 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
"3.4.1"
"3.4.2"
"3.4.3"
"3.4.2"
"3.3.1"
"3.3.2"
"3.3.3"
n All codes (except for BCC) from STX and data to ETX are expressed in ASCII codes.
n In assembling a program for a high-level computer, see "7. Table of identifiers (codes)" and "8.
Table of ASCII codes" at the end of this manual.