14
Ao.Lo: Analog lower limit setting; Ao.Hi: Analog upper limit setting; Aol.U: single channel Analog output selective setting; setting
range see 5.2 menu symbol and meaning.
Example: AC500/5A, corresponding output one channel 4-20mA (i.e., ACOA corresponding 4mA; AC500A corresponding 20mA)
Setting Ao.Lo:000 (%); Ao.Hi: 100(%); Ao1.U:1 (Default output A phase)
Explanation: Ao.Lo, Ao.Hi setting is a percentage of rated input.
Ao1. U: 11ndicate A phase; 2 Indicate B phase;3 Indicate C phase;
Note: When adding meter function is / M3, Aol.U must be 1 ;three Analog corresponding to three phase.
5.4.6 Liquid crystal backlight control
Enter Prog menu, left/right key select LCd web page, press ENTER to enter revising condition; press left/right key to revise Liquid
crystal
backlight
time
000-250s, to
LED display
meter,
this
item
is
invalid.
000
：
Indicate
Liquid crystal backlight lights.
250: Indicate Liquid crystal backlight after pressing for 250 seconds without operation, switch to glimmer light condition, to prolong
backlight service life.
5.4.7 Program password setting
Enter Prog menu, left key select PASS web page, press ENTER to enter revising condition; press left/right key to carry out password
revising, password range 0000-9999, press ENTER to confirm revising. After revising, programming protective password and switching
output Control protective password are new password.
Default password: 0000, omnipotence Password: 0008.
6. Communication Guide
6.1 General
AMC Series meter adopt compatible Modbus-RTU protocol: "9600, 8, n, 1”, in it 9600 is default baud rate, based on request, it can
be revised as 2400, 4800,
19200 etc., for the setting method see this instruction 5.4.3 communication parameter setting; 8 indicate have 8
data bit; n indicate no parity bit; 1 indicate have one stop bit.
Error detecting: CRC16(cyclic redundancy check)
6.2
Protocol
When Data frame reach terminal device, it enter addressed device by a simple "port", this device remove Data frame "envelope'(data
head), read data, if there is no error, executing task requested by data, then, add the new produced data in the obtained" envelope', return
the data frame to the transmitter. Returned responding data include following content: slave terminal address (Address), executed
command (Function), requested data produced by executing command (Data) and one CRC check code (Check). If any error occur, no
successful responding or returning one error indication frame.
6.2.1 Data frame format
Address
Function
Data
Check
8-Bits
8-Bits
N
×
8-Bits
16-Bits
6.2.2 Address (Address) domain
地
址
Address
功能
Function
数据
Data
校验
Check
8-Bits
8-Bits
N
×
8-Bit
16-Bits
