GM8802F-2 Field Mounting Transmitter
GM8802-F2110101
13
5.2 Communication protocols
GM8802F-4
support thress protocols:
GM-SP1
,
Modbus RTU
and
ASCII.
5.2.1 GM-SP1 protocol
Data format
:
7bits
,
1bit stop
,
even
(
7-E-1
)
7 bits
,
1 bit stop
,
odd
(
7-O-1
)
7 bits
,
2 bit stop
,
none
(
7-N-2
)
8 bits
,
1 bit stop
,
none
(
8-N-1
)
Baud rate
:
9600
、
19200
、
38400
、
57600
(
optional
)
Code
:
ASCII
Operation code
:
W
,
write
;
R
,
read
;
C
,
calibration
;
O
,
Option.
CRC
check sum
:
Add all of front digits and convert to decimal system, then take the last two
bits to convert to
ASCII
(
tens digit in the front and unit's digit at back
)
.
5.2.1.1 Parameters code table
Code
Parameter
code
Parameters
Description
R/W
FL
Digital filter
1
bit
:
0
~
9
in
ASCII
R/W
MR
Stability range
1
bit
:
1
~
9
in
ASCII
R/W
MT
Stability time
2
bits
:
01
~
10
in
ASCII
R/W
TR
Zero-tracking
range
1
bit
:
0
~
9
in
ASCII
R/W
TT
Zero-tracking
time
2
bits
:
05
、
10
、
15
、
20
in
ASCII
R/W
ZR
Zeroing range
2
bits
:
01
~
99
in
ASCII
R/W
UN
Unit
1
bit
:
0
~
3
in
ASCII
R/W
PT
Decimal digits
1
bit
:
0
~
4
in
ASCII
R/W
VC
Anti-vibration
rate
2
bits
:
0~99
in
ASCII
R
DD
Minimum division
2
bits
:
01/02/05/10/20/50
in
ASCII
R
CP
Maximum
capacity
6
bits
:
000000
~
999999
in
ASCII
R
AM
Absolute millivolt
7
bits
:
D6D5D4D3D2D1D0
D6
:
+
D5-D0:6
digits millivolt value
in
ASCII
,
fixed
4
decimal digits
R
RM
Zero-relatived
millivolt
7
bits
:
D6D5D4D3D2D1D0
D6
:
+/-
D5 D0 6
di it illi
lt
i
ASCII
fi
d
4
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