Delta ASD-A2 Series User Manual

ASDA-A2 Chapter 9 Communications
9-14 Revision February, 2017
 LRC and CRC transmission Error Checking
The error checking in ASCII communication mode is LRC (Longitudinal Redundancy Check); CRC
(Cyclical Redundancy Check) is for RTU communication mode. The algorithm of both is as the
following.
LRC (ASCII mode):
Start ‘:’
Slave address
‘7’
‘F’
Function
‘0’
‘3’
Starting data address
‘0’
‘5’
‘C’
‘4’
Number of data
‘0’
‘0’
‘0’
‘1’
LRC Check
‘B’
‘4’
End 1 (0DH)(CR)
End 0 (0AH)(LF)
The LRC algorithm is: add all byte, round down the carry and take 2’s complement. For example,
7FH + 03H + 05H + C4H + 00H + 01H = 14CH, round down carry 1 and take 4CH.
2’s complement of 4CH is B4H.

Delta ASD-A2 Series Specifications

General

Control Mode	Position, Speed, Torque
Feedback	Incremental encoder, Absolute encoder
Rated Output Power	0.1 kW to 15 kW
Power Supply	200-230V AC
Communication Interface	RS-485, CANopen
Protection Features	Overload, Overvoltage, Overcurrent, Overheat