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Section 4
4.2 Protocol specifications
V700-L21
User's Manual
Section 4
SECS Protocol Specifications
(9) Handling of system bytes
A system byte consists of a source ID and a transaction ID.
A source ID is a fixed value and is specified in setup mode.
The initial value of transaction ID is 1, and the maximum value is 0xFFFF. A transaction ID is
incremented every time a primary message is transmitted.
(10) Stalling
The type of stalling when BUSY state is present owing to internal buffer FULL, etc., is "NAK transmit".
(11) Action after timeout detection
T3 or T4 timeout is reported by means of S9F9 message.
■ SECS parameters
Parameter Default Range Resolution
Dual block detection 1: Perform 1: Perform, 0: Not perform
Source ID 0 0 - 32767 1
Single block No. 1 0, 1
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