
12.10 ■ Wiring Watlow Series F4S/D
Communications Wiring
Figure 12.10a — EIA/TIA 485 and EIA/TIA 232 Communications
Figure 12.10b — 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 resistors
may be needed on the first unit to maintain the correct voltage during the idle
state.
Figure 12.10c — EIA/TIA-232 Connections
B
A
GND
+5V
T+/R+
T-/R-
1KΩ
120Ω
1KΩ
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 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16
Com
1 2 3 4 5 6 7 8 9 10 11 12 13 14
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 26 27 28 29 30 31 32
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
59 60 61 62
48 49 50
45 46 47
51 52 53 54 55 56 57 58
33 34 35
36 37 38
39 40 41
42 43 44
1 2 3 4 5 6 7 8 9 10 11 12 13 14
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 26 27 28 29 30 31 32
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
59 60 61 62
48 49 50
45 46 47
51 52 53 54 55 56
57 58
33 34 35
36 37 38
39 40 41
42 43 44
11
12
1 2 3 4 5 6 7 8 9 10 11 12 13 14
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 10 11 12 13 14
1 2 3 4 5 6 7 8 9 10 11 12 13 14
15 16
Receive
Transmit
16
COM.
EIA/TIA 485 EIA/TIA 232
16COM.
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WARNING:
To avoid damage to
property and equipment,
and/or injury of loss of
life, use National Electric
Code (NEC) standard
wiring practices to install
and operate the Series
F4. Failure to do so could
result in such damage,
and/or injury or death.
¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥ ¥
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
¥ ¥ ¥ ¥
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
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