Omron C200H-MC221 -, Operation Manual

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191
Absolute data is processed in the following sequence.
SEN signal
Phase A
Phase B
Undefined
Serial data Initial incremental
pulses
Incremental pulses
120 to 300 ms
Undefined
100 ms max.
10 to 25 ms
1 to 3 ms
25 ms max.
1, 2, 3... 1. The SEN signal level is set to high.
2. After 100 ms, the system enters serial data reception wait status.
3. The system receives 8 bytes of serial data.
4. The system enters normal incremental operation status about 50 ms after
the last serial data is received.
The following table shows phase-A serial data specifications for absolute data.
Phase-A Serial Data Specifications
Data transmission method Asynchronous
Baud rate
9,600 bps
Start bit 1 bit
Stop bit 1 bit
Parity Even
Character code ASCII 7 bits
Data format 8 characters (P or A) (+ or –) (0 to 9) x 5 digits (CR)
Serial Data
P or A,
0 to 9
Start
bit
Data
Even
parity
CR
+ or –
During normal operation, the number of revolutions (5 digits) from the reference
position (specified at setup) is output as serial data in the above format.
Zero revolutions are output as “P+00000(CR)” or “P–00000(CR).” The number
of revolutions exceeding ± 99999 will not be output correctly. In other words, after
exceeding ± 99999, the number of revolutions will return to 000000.
Absolute Data Reception
Procedure
Phase-A Serial Data
Specifications for Absolute
Data
Absolute Encoder Interface Specifications
Section 7-8