Specifications

3-2 Command Set
When checksum is enable then [Checksum] is needed, it is
2-character. Both command and response must append the checksum
characters.
How to calculate checksum value ?
[Checksum] = ((LeadingCode)+(Addr)+(Command)+[Data]) MOD 0x100
Example 1: checksum is disable
User Command : $012<CR>
Response : !01400600<CR>
$ : LeadingCode
01 : Address
2 : Command (Read Configuration)
<CR> : Carriage return 0x0D
Example 2: checksum is enable
User Command : $012B7<CR>
Response : !01400600AC<CR>
$ : LeadingCode
01 : Address
2 : Command (Read Configuration)
B7 : Checksum value
<CR> : Carriage return 0x0D
‘$’ = 0x24 ‘0’ = 0x30 ‘1’ = 0x31 ‘2’ = 0x32
B7 = ( 0x24 + 0x30 + 0x31 + 0x32 ) MOD 0x100
‘!’ = 0x24 ‘0’ = 0x30 ‘1’ = 0x31 ‘4’ = 0x34
‘6’ = 0x36
AC = ( 0x24 + 0x30 + 0x31 + 0x34 + 0x30 + 0x30 + 0x36 + 0x30
+ 0x30 ) MOD 0x100
Note : 1. There is no spacing between the command words and
The checksum characters.
2. Every command follows a <CR> carriage return for
ending.
3. The checksum characters are optional.