ThingMagic M5e-Compact - Manual (Page 207)

Demo Application
Appendix B: Getting Started - Devkit 207
Unexpected Results
Sometimes you do not get the results that you expected. The following sections explain
some problems that can occur when the previously listed sequence of commands are
used. The following sections explain some of the frequently encountered errors.
Serial Communication Does Not Work
If serial communications fails to work using the ArbSer command, check the following:
The baud rate is correct.
If the baud rate of the boot loader or application FW was changed, then specify the
current baud rate using ArbSer. For example, “ArbSer <baudrate> ...”.
The correct COM port is being used.
ArbSer does not return an error if it is able to open the specified COM port. Currently,
ArbSer works on COM1 to COM9.
The commands are properly formed.
If no SOF byte (0xFF) is used, or an incorrect CRC or number of data elements is
specified, then the Microprocessor does not respond to the message at all.
The module is properly connected and powered on.
The serial cable should not be a NULL modem cable.
The PC serial port is working properly.
An RS-232 line checker is helpful for this.
A simple way to check that serial communications is working is to try sending a Get
Version
command. If a valid response is received, then the physical communication layer
is intact and working properly. That is to say that the baud rate, COM port, and cables are
all fine.
Commands Return a Non-Zero Status Code
If a command returns a non-zero status code, this is not always an error. However, if a
non-zero code is received in response to a Set command, such as Set Current Tag
Protocol
, Set Read TX Power , or Set Antenna Port commands, it is likely that one of
the following problems exists:
The module is still executing the boot loader program.