Preparation for Communication
HEC
1-1
1
Preparation for Communication
Make preparation for using communication facility as follows.
1) Turn off the power switch of Thermo-con.
2) Connect communication cable to communication connector (RS-485 of RS-232C) of Thermo-con.
･
Use twist pair shield cable as communication cable.
･
Connect the host and thermo-con with the cross cable for RS-232C and the straight cable for RS-485.
･
Connect shielded cable of communication cable to communication connector and drop it to FG(flame
ground).
･
Connection drawing for communication is shown in the Figures 1-1 and 1-2.
･
Length of communication cable for RS-485 shall be limited to around 500[m] in total, and that for RS-
232C shall be 15[m].
･
If communication cable for RS-485 is longer, connect terminating resistance (220
Ω
,1/2w) to each
＋
and
－
terminal of the host computer and the farthest Thermo-con.
3) Turn on the power switch of Thermo-con.
4) Select communication types for all Thermo-cons. See the operation manual of the details.
5)
That’s all for preparation of communication. Then if a communication command from the host
computer is given, each Thermo-con will reply it.
Figure1-2 Communication Connection (RS-232C)
Host Computer
RS-232C
Symbol
FG
RD
SD
SG
Thermo-con
RS-232C
RS
CS
Short
Pin No.
Connector
shell
2
3
5
Symbol
FG
RD
SD
SG
Figure1-1 Communication Connection (RS-485)
Host Computer
RS-485
Thermo-con
No.1
RS-485
Thermo-con
No.2
RS-485
Thermo-con
No.3
RS-485
Internal connection
Terminating
resistance
220
Ω
1/2W
Terminating
resistance
220
Ω
1/2W
Internal connection
Internal connection
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Pin No.
Connector
shell
1
2
5
FG
+
-
SG
Symbol
Symbol
FG
+
-
SG
Thermo-con No.16