–9–
M-2911 BlueJay Wireless Data Transceiver
Detailed elements of a typical Point to Multipoint configuration are as follows:
a. One M-2911 (Master) is connected to the RS-232 port of a modem in the control house of a
substation using a straight through RS-232 cable.
It is configured as a master unit. (See the Addressing section under AT commands for
details) i.e. ATS=1, ATD=251, ATM=252.
b. Nine M-2001B Regulator Controls are located throughout a substation yard, each with an
M-2911 connected to it using a straight through RS-232 cable connected to the M-2001B
COM 1 Port.
Each M-2911 is configured as a Slave unit. (See the Addressing section under AT
commands for details) i.e. ATS=2 to 250, ATD=1, ATM=251
c. At a remote location, an RTU has been configured to dial the modem located at the control
house and poll each unit at the substation at 5 minute intervals. For this application to
operate successfully, the RTU cannot poll all units simultaneously.
In addition to these methods, the M-2911 can be configured using RS-485 or RS-422. See the following
figures for examples.
Application Information
t
i
u
c
r
i
C
l
a
n
g
i
S
S
9
-
B
D
2
3
2
-
S
R
B
B
X
R
a
t
a
D
e
v
i
e
c
e
R
2
n
i
P
A
B
X
T
a
t
a
D
ti
m
s
n
a
r
T
3
n
i
P
A
C
S
T
R
d
n
e
S
o
t
t
s
e
u
q
e
R
7
n
i
P
B
C
S
T
C
d
n
e
S
o
t
r
a
e
l
C
D
C
R
T
D
y
d
a
e
R
l
a
n
i
m
r
e
T
a
t
a
D
4
n
i
P
F
C
D
C
D
t
c
e
t
e
D
r
e
i
r
r
a
C
a
t
a
D
B
A
D
N
G
d
n
u
o
r
G
l
a
n
g
i
S
5
n
i
P
Table 1 RS-232 Communication Port Signals
