1 - 3
1 Communications Methods
E5
C-T Digital Temperature Controllers Programmable Type Communications Manual (H186)
1-1 Ove
rvie
w
of Com
m
u
n
ica
-
tio
n
s Met
hod
s
1
1-1-3
T
ransmission Proce
dure
When the host transmits a command frame, the E5
@
C-T transmits a response frame that corresponds
to the command frame. A single response frame is returned for each command frame. The following
diagram shows the operation of the command and response frames.
Communications with the host are carried out through a standard RS-485 interface. Use a K3SC Inter-
face Converter for RS-485 interface conversion.
RS-485
•
The RS-485 connection can be either one-to-one or one-to-N. Up to 32 units including the host
can be connected in a one-to-N system.
•
The total cable length is 500 m max.
•
Use a shielded twisted-pair cable with a wire gauge of AWG24 to AWG18 (cross-sectional area of
0.205 to 0.823 mm
2
).
E5CC-T/EC-T/AC-T
1-1-3
Transmission Procedure
1-1-4
Interface
1-1-5
Wiring
E5
@
C-T
Command frame
Command frame
Response frame
Host
Allow a wait time of at least 2 ms before the next command is sent after the host
receives a response from the E5
@
C-T.
RS-4
8
5
14
13
RS-4
8
5
6.
8
V
TX
RX
14
13
FG
−
+
SG
A (
−
)
B (+)
A (
−
)
B (+)
120
Ω
(1/2
W
)
A
bb
re
v
iation
Pin
A
bb
re
v
iation
Specify
b
oth ends of the transmission path incl
u
ding the host
as the end node (that is, connect terminators to
b
oth ends).
Use a terminating resistance of at least 54
Ω
.
Host
E5CC-T/EC-T/AC-T
E5CC-T/EC-T/AC-T
End node
RS-4
8
5
Shield
Shield
Terminator
Use a 120
Ω
(1/2
W
)
terminator.
A < B: "1" Mark
A > B: "0" Space
Comm
u
nications
transcei
v
er
Pin
A
bb
re
v
iation
Summary of Contents for E5CC-T
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Page 184: ...Index 4 E5 C T Digital Temperature Controllers Programmable Type Communications Manual H186...
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