Omron V640-HS61, Руководство пользователя, Страница: 157 / 174

CIDRW System
User’s Manual
SE
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TION
6
Chara
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Condition
s of Use
SECTION 6
Appendix
155
Communications Time
Regardless of whether SECS is used or not, take the time required for processing between the host
device and Amplifier Units into account when designing the system.
Communications time calculation formula (unit: ms)
READ: 138.7 × (number of pages) + 10.0
WRITE, SAME WRITE: 379.8
×
(number of pages) + 145.4
BYTE WRITE: 383.0 × (number of pages/8) + 249.0
TAT calculation formula (units: ms)
TAT = command and response transmission time + communications time
The command and response transmission time differs depending on the number of characters
sent and the communications conditions.
This calculation applies to continuous transmission in which the Controller uses no spaces
between command characters.
Example of TAT calculation:
Number of command characters: A; number of response characters: B
Baud rate: 9600 bps, data length: 8 bits, non parity, 1 stop bit
Time Description
Communications time This is the time required for communications between an ID Tag and the CIDRW Head.
TAT This is the time required for processing at the Amplifier Unit, seen from the host device.
Host
Amplifier Unit
Command
Response
Communications time
TAT
Rounding up
Transmission time (ms) =
Number of bits per character (bits)
×
1000
Baud rate (bps)
× total number of characters of command and response
TAT (ms) =
10 × 1000
9600
×
(A + B) + Communications time (ms)