Hitachi EH-150 Series - Page 56

Chapter6 Communication Mode
6 - 14
Fre
e Protocol
(2) Sample program description
The s parameter and the sending data area parameter are set upon first scan.
TRNS 9 will be performed at 2nd scan (falling of R7E3), and initial settings for basic unit (unit 0) and port 1 of slot
1 are shown in the following table.
Items
Setup value
Setup contents
Communication mode
H0000
Free protocol mode
Message composition
H13xx
Start character + data + check code + stop character
Modem line control
Hxx0x
RS, ER regular ON
Data conversion type
Hxxx0
Through type
Start character
H02FF
STX (02)
Stop character
H0D0A
CR/LF (0D0A)
Check code calculation type
H0003
Byte, ASCII, Sum
Receiving timeout interval
100
1000 ms
Data interval time
-
Disabled because of stop code used
« Note »
 TRNS 9 is initialized at the 1st scan. So other settings and operations should be executed after the 2nd scan.
 Both initial setting and communication are operated by TRNS command however, do not use TRNS command
twice or more for a port. So each setting must be configured by one TRNS command with different parameter
tables.