Installation
Hardware Installation and Maintenance Manual 3
–19
.
Table 3–4 Output signal connections (two-wire RS-485 configuration)
SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
Time-
out
1
(ms)
1. Time-out selections are equal to one character time at the indicated baud rate.
R11
(KΩ)
RS-485
2-Wire
Half Duplex
ON ON ON ON
120 Ω Built-in
Term in a tio n
ON
External or no
Term in a tio n
OFF
1200 Baud
OFF OFF OFF
8.330
2
2. To achieve this time-out, an appropriate through-hole resistor must be placed in the R11
location on the converter PCB
.
820
2400 Baud
OFF OFF ON 4.160
4800 Baud OFF ON OFF 2.080
9600 Baud ON OFF OFF 1.040
19.2K Baud ON ON ON 0.580
38.4K Baud
OFF OFF OFF
0.260
2
27
57.6K Baud
OFF OFF OFF
0.176
2
16
115.2K Baud
OFF OFF OFF
0.087
2
8.2
Figure 3–8 Optically isolated RS-232-to-RS-485
converter DIP switches
INTERNAL TERMINATION NOT USED
9600 BAUD
RS-485 TWO-WIRE
x
x
x
x
x
x
x
x
x
1
2
3
4
5
6
7
8
OFF ON
GND
DATA TD B(+)
DATA TD A(-)
M
H
G
CABLE SHIELD SHOULD
BE GROUNDED
M L K
J
H
G
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