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α
2 Simple Application Controllers
The Command String 7
7 - 15
7.4 Communication Timing Chart
The communication time for
α
2 Series dedicated protocol is represented by the diagram
below. The communication time is identical for Read and Write operations. Thus, only one
diagram has been used to demonstrate the possible delaytimes for sending and receiving 8-bit
binary messages.
7.4.1 Read/Write Data from the Controller
Format B READ/WRITE operation
7.4.2 Communication Time
The calculation performed below are a guide to the approximate communication timing for
dedicated protocol.
T0,T1,T2 = 1/Baud Rate x No. of bits in 1 character x No. of Characters
= 1/9600 x [1 (Startbit) x 8 (datalength) x 0 (parity none) x 1 (stopbit] x No. of characters
TP = Process Time *1
maximum time of 2.5s
Tw = 5ms + maximum of 1 scan time
maximum time of 2.5s
Note:
*1 Process Time - Represents the duration needed for the
α
2 Series Controller to process
with either READING the intended device or WRITING to the intended devices specified in
the Command String. 1scan time + 5ms is the minimum time used for the Process Time.
STX
02H
ETX
03H
STX
02H
!
21H
STX
02H
ETX
03H
Computer
α
2 Controller
Time Chart
Line
Communication
Line
T
0
Tw TP T
2
T1