Documentation Number – MED101A_1009qsg
PN8460-r000
Black Box Corporation
– 1000 Park Drive – Lawrence, PA 15055-1018
Tech Support and Ordering: 724-746-5500 – FAX: 724-746-0746
To contact us about Black Box products or services:
RS-422/485 4-Wire
RS-232
Multi-drop Ring
Maximum Converters in a Multi-drop Ring
Baud Rate
RS-232
RS-422/485
≤
19.2 kbps
32
32
37.4 kbps
16
24
115.2 kbps
2
8
Use 62.5/125 micro-meter
multi-mode fiber optic cable
with ST connectors.
Set DIP Switch position 12 to ON.
Connect FO transmitter to FO
receiver and vise versa.
NOTE: Fiber optic transmitter
light is ON in the idle state
8
8
.
.
R
R
S
S
-
-
2
2
3
3
2
2
L
L
o
o
o
o
p
p
b
b
a
a
c
c
k
k
T
T
e
e
s
s
t
t
1.
Configure the converter for RS-232.
2.
Set DIP Switch position 12 to OFF.
3.
Cross connect the fiber optic transmitter to the fiber optic
receiver.
4.
Connect a PC to the serial port.
5.
Using hyper terminal or similar program, connect to the
appropriate COM port. Ensure hyper terminal local echo is
off.
6.
Transmit data. If the same character string is returned, the
test is good.
7
7
.
.
F
F
i
i
b
b
e
e
r
r
O
O
p
p
t
t
i
i
c
c
Point-to-Point
