Applied Motion RS-232 - Manual (Page 244)

244 920-0002 Rev. I
2/2013
Host Command Reference
number for the “BLuAC5-Si”
The power-up packet is always sent at 9600 baud, regardless of the bit rate set by the BR or PB command.
If an Applied Motion software application is present it will respond to the power-up packet and communications will
continue at 9600 baud. If an Applied Motion software application is not present, the drive’s request made by the
power-up packet will time-out and the drive will begin communicating at the saved bit rate (BR or PB command),
9600 or otherwise.
Interaction with PM parameter (Power-up Mode): If the drive is currently in power-up modes 1 or 3
(PM1 or PM3), it will be unable to respond to standard SCL commands. In these modes the drive is using a
proprietary communication protocol used by Si Programmer (and its interface to the SiNet Hub units) as well as
the QuickTuner and Configurator software programs. Standard SCL commands will not be recognized or acted
upon by the drive in these modes. If the application requires it, the drive may be temporarily forced into SCL
mode through the use of the “double zero.”
Double Zero: When the drive initializes, it will send the power-up packet as detailed above. Typically
this packet is used only by Applied Motion Products software, but a host device may also use it to force SCL
communication in a drive otherwise not configured to do so.
The host device must recognize the power-up packet and respond with a simple double zero (00). No
carriage return is required. Note that this response must occur within 2 seconds of the power-up packet being
sent, but must delay at least 2 milliseconds (0.002 sec). This will force the drive into standard SCL mode and
enable serial communication without altering the PM setting of the drive.
Communication Errors
During the process of sending communication packets between the host and drive(s), two different types of
communication errors can occur.
Hardware errors: Hardware errors are displayed physically by a drive (via either LEDs or a 7-segment
display on the drive, see Appendix F), but no response packet is automatically generated from the drive to the
host. Therefore it is the responsibility of the host to check for hardware comm errors using the AL, RS, and/or SC
commands. See Appendix F for more details on the AL and SC commands. Once the host has determined the
presence of a hardware comm error, the nature of the error can be retrieved using the CE command.
Parsing errors: Parsing errors happen when a drive receives a command packet but cannot properly
interpret (parse) the command. Parsing errors can automatically generate a response packet from the drive to the
host, depending on the settings of the PR command (see Appendix D, PR command, Bit 2).