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3.2.2
Setting Meter Address
Each outstation (meter) on a multi-drop Modbus system is identified to the master
by a unique address. The GIMA may be addressed anywhere in the full Modbus
range of 1-247.
Enter the programming mode on the GIMA as described in the meter's Instruction
Manual. Scroll through program settings using
Addr.'
Figure 3.3. Setting the Modbus Address
1
Press
to select to increment the Modbus Address.
2
Press
to decrement the Modbus Address.
3
Press
and hold for two seconds to finish.
4 Modbus Communication
4.1
Description
The GIMA Options Module provides a serial communications interface to external
systems. This allows remote reading and programming of the meter by a host
computer (e.g. PC). The output may be wired as RS-232 (full duplex) or RS-485
(half duplex).
The communication protocol used is a subset of Modicon's Modbus, enabling use
of standard off-the-shelf software packages and connection to standard control-
lers.
4.1.1
Communication Address
Each meter on a Modbus serial communication network must be assigned a unique
address between 1 and 247. This is carried out in programming mode, as de-
scribed in section 3.2. If two or more meters, connected in a multi-drop network
have the same address, data on the network will be corrupted and communication
will fail.
until the meter displays 'Cube
r
8
4.5.10 Function 08 Loop Back Diagnostic
Description
This function provides a simple means of testing the communication network and
detecting if a particular meter is present. This command is not available as a
broadcast command as it requires a return data packet from the meter.
Host Request
M
E
T
E
R
A
D
D
R
E
S
S
F
U
N
C
I T
O
N
D
A I
G
N
O
S
T
C I
C
O
D
E
(
H
g i
h
B
t y
) e
D
A I
G
N
O
S
T
C I
C
O
D
E
L (
o
w
B
t y
) e
D
A I
G
N
O
S
T
C I
D
A
T
A
(
H
g i
h
B
t y
) e
D
A I
G
N
O
S
T
C I
D
A
T
A
L (
o
w
B
t y
) e
C
H
E
C
K
S
U
M
(
H
g i
h
B
t y
) e
C
H
E
C
K
S
U
M
L (
o
w
B
t y
) e
The example above shows a command with a Loop Back Code of 0 and Diagnos-
tic Data of 1000 (03H E8H). The meter accessed has a Modbus ID of 15 (19H).
Meter Response
M
E
T
E
R
A
D
D
R
E
S
S
F
U
N
C
I T
O
N
D
A I
G
N
O
S
T
C I
C
O
D
E
(
H
g i
h
B
t y
) e
D
A I
G
N
O
S
T
C I
C
O
D
E
L (
o
w
B
t y
) e
D
A I
G
N
O
S
T
C I
D
A
T
A
(
H
g i
h
B
t y
) e
D
A I
G
N
O
S
T
C I
D
A
T
A
L (
o
w
B
t y
) e
C
H
E
C
K
S
U
M
(
H
g i
h
B
t y
) e
C
H
E
C
K
S
U
M
L (
o
w
B
t y
) e
The reply format is a copy of the command confirming its validity.
B
Y
T
E
E
X
A
M
P
1
1
9
H
2
0
8
H
3
0
0
H
4
0
0
H
5
0
3
H
6
E
8
H
7
E
3
H
8
6
D
H
B
Y
T
E
E
X
A
M
P
1
1
9
H
2
0
8
H
3
0
0
H
4
0
0
H
5
0
3
H
6
E
8
H
7
E
3
H
8
6
D
H
25
L
E
L
E
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