Hitachi EH-150 Series - Page 49

Chapter6 Communication Mode
6 - 7
Free Protocol
 s parameter of initial setting
Initializing command (specified as s+7) is H0000. Although nothing is stored in the receiving data area specified by
s+B-s+D upon the performance of the initial setting command, please set during parameters in s+B to s+D.
Figure 6.7 s parameter format (Free protocol / Initial setting)
 Sending data area of initial setting
The sending data area parameter composition (the top I/O address is specified in s+9 and s+A) is as follows:
Figure 6.8 Sending data area format (Free protocol / initial setting)
The meaning and setting value of each parameter are shown below.
[1] Number of send data (bytes)
The number of bytes of the data sent to EH-SIO is specified. Since the setting parameter is fixed to seven words,
the number of transmission data bytes should be set to 14 bytes (14 / H000E).
[2] Communication mode specification
When you using free protocol mode, please set to H0000.
[1] No. of send data (byte) [Fixed]
[4] Start character
[6] Check code calculation type
[2] Free protocol mode [Fixed]
[3] Message composition/Modem line control/Data conversion type
H 0 0 0 E
H 0 0 0 0
(Refer to below)
[5] Stop character
[8] Data interval time
[7] Receiving timeout time
(Refer to below)
(Refer to below)
(Refer to below)
(Refer to below)
(Refer to below)
Top I/O address of
receiving data area
Size of receiving data area
Return code
H0000 (Command)
s
s+7
s+8
s+9
s+B
s+D
System area ( 6 words )
Set by user
Command timeout time
Top I/O address of
sending data area
Dummy parameter