7
3 Operation
3.1
Local Communications (Meter-Options Module)
Once connected and powered up, the GIMA and Options Unit will begin communi-
cating with each other automatically. All readings taken by the meter are sent to
the Options Module each second, along with all meter program settings. The
Options Module replies with confirmation of the values and any requests to alter
meter settings.
The GIMA will confirm that it is correctly connected to an Options Module by illumi-
nating the
Options
LED on its front panel. If for any reason the local communica-
tions fail, this LED will switch off.
3.2
Programming
The GIMA programming menu will automatically expand to include Baud Rate
and Address settings when a valid Modbus Options Module is detected.
3.2.1 Setting Baud Rate
Remote serial communications speeds of 4800, 9600 or 19200 may be selected
to suit external system requirements. Higher speeds will provide faster data ac-
cess, while a slower speed may be required in electrically noisy environments.
Enter the programming mode on the GIMA as described in the meter’s Instruction
Manual. Scroll through the program settings using until the meter displays
‘Baud Rate.’
1
Press
to select the next highest available baud rate setting.
2
Press
to select the next lowest available baud rate setting.
3
Press
and hold for two seconds to finish.
r t
26
4.5.11 Function 16 Preset Multiple Registers
Description
This function allows a number of registers in a meter table to be set, by the host, in
a single operation. When broadcast (address = 0), all meters on the network are
addressed together, but none reply.
Host Request
The example above simultaneously writes 00 to all three peak hold voltage regis-
ters (V1 Peak Hold = Table 13, Offset 3). The meter accessed has a Modbus ID of
25 (19H).
E
T
Y
B
E
L
P
M
A
X
E
S
S
E
R
D
D
A
R
E
T
E
M
1
H
9
1
N
O
I
T
C
N
U
F
2
H
0
1
)
e
t
y
B
h
g
i
H
s
s
e
r
d
d
A
(
R
E
B
M
U
N
E
L
B
A
T
3
H
D
0
)
e
t
y
B
w
o
L
s
s
e
r
d
d
A
(
T
E
S
F
F
O
E
L
B
A
T
4
H
3
0
)
e
t
y
B
h
g
i
H
(
)
N
(
S
D
R
O
W
A
T
A
D
F
O
R
E
B
M
U
N
5
H
0
0
)
e
t
y
B
w
o
L
(
)
N
(
S
D
R
O
W
A
T
A
D
F
O
R
E
B
M
U
N
6
H
3
0
)
N
2
(
S
E
T
Y
B
A
T
A
D
F
O
R
E
B
M
U
N
7
H
6
0
1
E
T
Y
B
A
T
A
D
8
H
0
0
2
E
T
Y
B
A
T
A
D
9
H
0
0
3
E
T
Y
B
A
T
A
D
0
1
H
0
0
4
E
T
Y
B
A
T
A
D
1
1
H
0
0
5
E
T
Y
B
A
T
A
D
2
1
H
0
0
6
E
T
Y
B
A
T
A
D
3
1
H
0
0
)
e
t
y
B
h
g
i
H
(
M
U
S
K
C
E
H
C
4
1
C
0
)
e
t
y
B
w
o
L
(
M
U
S
K
C
E
H
C
5
1
B
F