Yamato DKG610, Instruction Manual

Page: 45 / 70

42
4. Operating procedures
Option (RS485 communication function)
4. Transmission control procedures
4.1 Communication procedures
・
The Unit returns
“reply message” in response to a “request message” from a host PC.
Thus, the Unit will never start transmission.
・
The Unit does not make any communication for about four seconds after power on (no reply).
Set some delay before start of communication after power on.
4.2 Message types
■
Types of messages include the transmission request message from a host PC and the
transmission reply message from the Unit.
■
All code (excluding BCC) including STX, address, request content, identifier, and ETX are
expressed in ASCII codes.
4.3 Configuration of the request message
（
Transmission from a host PC to the Unit
）
4.3.1 Configuration of the read request message
S
T
X
□ □ R □ □ □
E
T
X
B
C
C
① ② ③ ④ ⑥ ⑦
4.3.2 Configuration of the write request message
S
T
X
□ □ W □ □ □ □ □ □ □ □
E
T
X
B
C
C
① ② ③ ④ ⑤ ⑥ ⑦
BC
C d
at
a
St
art
c
od
e
Ad
dre
ss
R/
W
Re
que
st
Id
ent
if
ie
r
En
d c
od
e
St
art
c
od
e
Ad
dre
ss
Re
que
st
Id
ent
if
ie
r
Nu
mer
ic
d
ata
En
d c
od
e
BC
C d
at
a
R
/W