ADTEK ST-LC, Operation Manual, Page: 32 / 36

ST-LC OPERATION MANUAL(EN) 2011-04-27
31 / 35
Analogue
Output
1.Check if the display is jittery A. If the input signal was jittery continuously, please set higher
value in
[
avg
]
(A1-12 or A2-12) or
[
mVavg
]
(A1-13 or
A2-13)
B. If the input signal is jittery with a uncertain period that caused
by the inductive load actions, please set higher value in
[
Dfilt
]
(A1-14 or A2-14)
C. Please does not lay the wires of input together with
high-voltage lines or power lines. As a general rule, wire
connecting with the meter has to be in a separate system,
use an independent metal conduit, or use shielded cable.
2.Check if the display is stable Please do not lay the wires of output together with high-voltage
lines or power lines. As a general rule, wire connecting with the
meter has to be in a separate system, use an independent
metal conduit, or use shielded cable.
RS485 Communication Issue:
PROBLEM CHECKING LIST REMEDY
Can not link Check if the square orange LED of
RS485 doesn’t bright.
A. Please check the
[
adres
]
(E-1)
、
[
baud
]
(E-2) and
[
prity
]
(E-3) in
[
rs485 group
]
that both have to match the
Host.
B. Please check the wiring A(+) and B(-) are correct or not?
C. If user uses a converter (RS485/RS232 or RS485/USB..),
please check the converter of setting and wiring is correct or
not?
D. Please check the protocol of host is Modbus RTU Mode
1. Check if the square orange LED of
RS485 dose bright, but no reply. A. Please confirms the CHECH SUM program is correct.
B. Please check the interval of each command has to over
3.5byte.
Reply wrong
data from the
meter
2. Check if the square orange LED of
RS485 dose bright, but reply
Error.
A. Please checks the address table of RS485 to assume
whether did the address right or not?
B. Please checks the start address and data format are correct.
C. Please do not lay the wires of RS485 together with
high-voltage lines or power lines. As a general rule, wire the
meter in a separate system, use an independent metal
conduit, or use shielded cable.
■
RS485(Modbus RTU Mode)
■
Modbus RTU Mode Protocol
1. Function 03H (Read Holding Registers)
Request Data Frame
；
EX: Read the data of display value(0000H starts from 1 Word)
SLAVE
Address
FUNCTION Starting
Address Hi
Starting
Address Lo
No. of Word
Hi
No. of Word
Lo
CRC
Lo
CRC
Hi
01H 03H 00H 00H 00H 01H 84H 0AH
Response Data Frame
；
EX: The response value is ”0”
SLAVE
Address
FUNCTION Byte
count
Data
Hi
Data
Lo
CRC
Lo
CRC
Hi
01H 03H 02H 00H 00H B8H 44H
Request Data Frame
；
EX: Continue to request the data of 10 points
SLAVE
Address
FUNCTION Starting
Address Hi
Starting
Address Lo
No. of Word
Hi
No. of Word
Lo
CRC
Lo
CRC
Hi
01H 03H 00H 00H 00H 0AH C5H CDH
Response Data Frame
SLAVE
Address
FUNCTION Byte
count
Data(1)
Hi
Data(1)
Lo
… …
Data(10)
Hi
Data(10)
Lo
CRC
Lo
CRC
Hi
01H 03H 14H 00H 00H
… …
01H 00H -- --
2. Function 06H (Preset Single Register)
Request Data Frame
SLAVE
Address
FUNCTION
Code
Starting
Address Hi
Starting
Address Lo
Preset
DATA Hi
Preset
DATA Lo
CRC
Lo
CRC
Hi