pro bel Freeway Series, Руководство пользователя

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F
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r
r
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e
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e
w
w
a
a
y
y
R
R
a
a
n
n
g
g
e
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S
S
y
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s
s
t
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m
m
U
U
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r
G
G
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P
P
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-
-
B
B
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L
L
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3
3
2
2
H
H
U
U
-
-
F
F
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r
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w
w
a
a
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R
R
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S
S
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P P r r o o - - B B e e l l G G e e n n e e r r a a l l S S w w i i t t c c h h e e r r P P r r o o t t o o c c o o l l ( ( S S W W - - P P - - 0 0 2 2 ) )
Pro-Bel General Switcher Communication Protocol is a robust, asynchronous method
of controlling routing switchers. It is the preferred method of controlling Pro-Bel
routers.
The normal electrical parameters of the interface are:
· RS485
· 8 bit data
·
1 stop bit
·
EVEN parity
· 38.4K baud
Although the interface can be set to operate with any common RS485 and RS232
parameters.
The message format protocol is standard, and always conforms to the following
format:
SOM COMMAND MESSAGE CHECKSUM
Where:
SOM = Start of message = FF Hex
COMMAND = Command byte, which also defines message length
MESSAGE = May be zero or more bytes
CHECKSUM = 7 bit, 2s compliment sum of command and message field
(msb=0)
P
P
r
r
o
o
-
-
B
B
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l
l
G
G
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a
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R
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m
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C
C
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P
P
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o
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t
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c
c
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(
(
S
S
W
W
-
-
P
P
-
-
0
0
8
8
)
)
This protocol has been developed to provide a common and robust method of
interfacing Pro-Bel control systems to a variety of standard and custom applications.
It is the standard protocol for interfacing a controller to a remote device.