Hitachi EH-150 Series - Page 135

Chapter 6 Communication mode
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Simple data link
 Sending data area for Initial setting
Parameter structure of sending data area (s+9, s+A) is as follows.
Figure 6.67 Sending data area for simple data link mode initial setting
Each meanings and values of parameters are shown in below.
[1] Number of send data (bytes)
The number of data transmitted to EH-SIO is specified. This is the number of bytes from [2] to [7], which
depends on number of slave stations.
[2] Communication mode
Specify H30 for standard simple data link mode.
Specify H31 for high speed simple data link mode.
[3] Waiting time for slave response
Waiting time for slave response is the time from receiving request to sending response. Slave station will wait
specified time multiplied by 10ms, and reply to EH-SIO.
The possible value for configuration is 0 (no wait time) to 15(H000F) (waiting 150ms), and if the set value is out
of this range, initial setting error will be detected.
Figure 6.68 Waiting time for slave response
« Note »
This parameter is recommended to be configured as 20 ms or more for stable communication.
Response
Request
Waiting time
Ready to send response
EH-SIO
Slave
station
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[1] Number of send data (bytes)
[5] Setting data link area
[6] Number of words occupied by master
[2] Communication mode
H000E - H004A
H 0 0 3 0 / H 0 0 3 1
[7] Station number, words of slave station
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[3] Waiting time for slave response
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[4] Waiting between stations
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