Communications wiring, Eia/tia-232 connections, Figure 8.12a – Watlow Series F4P User Manual
Page 90: Figure 8.12b, Figure 8.12c
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I n s t a l l a t i o n a n d W i r i n g
Wa t l o w S e r i e s F 4 P
Communications Wiring
Figure 8.12a —
EIA/TIA 485 and EIA/TIA 232 Communications
Figure 8.12b —
Termination for EIA-232 to EIA-485 Converter
If the system does not work properly, it may need termination resistors at each
end of the network. A typical installation would require a 120-ohm resistor
across the transmit/receive terminals (12 and 13) of the last controller in the
network and the converter box or serial card. Pull-up and pull-down 1k ohm
resistors may be needed on the first unit to maintain the correct voltage during
the idle state.
Figure 8.12c —
EIA/TIA-232 Connections
• • • • • • • • • • • • •
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25
• • • • • • • • • • • •
• • • • •
1 2 3 4 5
6 7 8 9
• • • •
14 16 15
14 16 15
Wire
F4
DB 9
DB25
Color
232
Connector Connector
White
TX Pin 14
RX Pin 2
RX Pin 3
Red
RX Pin 15
TX Pin 3
TX Pin 2
Black
GND Pin 16
Gnd Pin 5
GND Pin 7
Green
GND Pin 24
N/U Pin 9
N/U Pin 22
Shield
N/C
Gnd Pin 5
Gnd Pin 7
B
A
GND
+5V
T+/R+
T-/R-
1K
Ω
120
Ω
1K
Ω
Converter box
termination
with pull-up
and pull-down
resistors.
1
2
3
4
5
6
7
8
9
10
11
12
13 14
1
5 16
1
2 3
4 5
6 7
8 9
10
11 12
13 14
1
5 16
Com
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
2
3
4
5
6
7
8
9
1
0
11
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
1
7
1
8
1
9
20
2
1
22
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
59
60
61 62
59 60 61 62
4
8
4
9
50
48 49 50
45 46 4
7
45 46 47
51
52
53 54 5
5
56
57
58
51 52
53 54 55 56 57
58
3
3
3
4
3
5
33
34
3
5
3
6
3
7
3
8
36
37
38
3
9
4
0
4
1
39
4
0
4
1
4
2
4
3
4
4
4
2
43
44
1
2
3
4
5
6
7
8
9 10 11
12 13 14 15 16
1 2
3 4
5 6
7 8
9
10 11
12 13
14 15 1
6
1
2
3
4
5
6
7
8
9 10 11
12 13 14 15 16
1 2
3 4
5 6
7 8
9
10 11
12 13
14 15 1
6
120
Ω
F4P #1
F4P #2
F4P #3 (last unit)
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1 2 3
4 5
6 7 8
9 10
11 12 13
14 15
16
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
17 18 19
20 21 22
23 24 2
5
26 27
28 29 30
31 32
5
9
6
0
6
1
6
2
59 60 61 62
4
8
4
9
5
0
48 49 50
4
5
4
6
4
7
45 46 47
5
1
5
2
5
3
5
4
5
5
5
6
5
7
5
8
51 52 53 54 5
5 56
57 58
3
3
3
4
3
5
33 34
35
3
6
3
7
3
8
36 37 38
3
9
4
0
4
1
39 40 41
4
2
4
3
4
4
42 43 44
11
12
1
2
3
4
5
6
7
8 9 1
0
1
1 12
1
3
1
4 1
5
1
6
1 2
3 4
5
6 7
8 9
10
11 12
13 14 15
16
T+/R+
5V+ termi-
nation bias
13
T-/R-
14
15
1
2
3 4
5
6 7
8
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1 2
3 4
5 6
7
8 9
10 1
1 12 13 14
15 16
Receive
Transmit
16
COM.
EIA/TIA 485
EIA/TIA 232
16
COM.
11
5V+ termi-
nation bias
ç
WARNING: To avoid
damage to property and
equipment, and/or injury
or loss of life, use
National Electric Code
(NEC) standard wiring
practices to install and
operate the Series F4P.
Failure to do so could
result in such damage,
and/or injury or death.