Samlex America SA-1500 - Manual (Page 23)

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8-2. Interface Command：
The buffer size used for the RS232 port is 12-bytes. This unit will ignore all
bytes more than this value.
During transmission, this unit (inverter) will indicate it is ready to receive data
from computer by the DTR line. A computer has to check the DTR line
before sending any information to this unit.
This unit is normally always ready to receive data while operating.
When a LF character (ASCll code 0AH) is received, this unit would finish the
receiving by clearing the DTR status and begin to interpret the received
information. The unit would execute the received command (AND/OR data)
if it is correct.
Irrespective of whether the command is accepted or not, the unit will always
send back a response signal to the computer and set DTR to ready for
receiving more incoming information.
8-2-1. The Baud Rate of the RS232 interface is determined by S5 and S6 of
DIP-SW, as shows in Appendix A.
Note ：You have to reset the unit after adjustment to activate the New
settings.
8-2-2. Illustration of the RS232 operation ：
8-2-2-1. RS232 command
Command format ：
This unit uses high-level language commands with a CR (0DH)
and a LF (0AH) as the end of the command.
The system would interpret and execute the command only
after these two characters are received.
After the unit execute the command, it would send a response
string to the computer.
The response string is as follows
：
= > CR LF ：Command executed successfully
? > CR LF ：Command error, not accepted
! > CR LF ：Command correct but execution error (e.g.
parameters out of range)
If the command needs any information from the unit, the unit
would send the information back to the computer (with CR
and LF) and then send the response string to the computer.