User`s manual

PK2200 Troubleshooting s 67
Dynamic C Will Not Start
In most situations, when Dynamic C will not start, an error message
announcing a communication failure will be displayed. Following is a list
of situations causing an error message and possible resolutions.
 Wrong Baud Rate  In rare cases, the baud rate has to be changed
when using the Serial Interface Board for development.
 Wrong Communication Mode  Both sides must be talking RS-232.
 Wrong COM Port  A PC generally has two serial ports, COM1 and
COM2. Specify the one being used in the Dynamic C Target Setup
menu. Use trial and error, if necessary.
 Wrong Operating Mode  Communication with Dynamic C will be
lost if the controllers jumper is set for standalone operation. Reconfig-
ure the board for programming mode.
 Wrong Memory Size  Jumpered pins on JP2 specify the EPROM
size.
If all else fails, connect the serial cable to the controller after power up. If
the PCs RS-232 port supplies a large current (most commonly on
portable and industrial PCs), some RS-232 level converter ICs go into a
nondestructive latch-up. Connect the RS-232 cable after power up to
eliminate this problem.
Dynamic C Loses Serial Link
If the program disables interrupts for a period greater than 50 millisec-
onds, Dynamic C will lose its serial link with the application program.
Make sure that interrupts are not disabled for a period greater than 50
milliseconds.
PK2200 Repeatedly Resets
The PK2200 resets every 1.0 seconds if the watchdog timer is not hit.
If a program does not hit the watchdog timer, then the program will
have trouble running in standalone mode. To hit the watchdog, make a
call to the Dynamic C library function hitwd.