Rockwell Automation Allen-Bradley ControlLogix 1756-MVI Programming Reference Manual page 109

Serial Port API 5-21
MVIsp_Putch
Example:
if (MVIsp_Putch(COM1, ';', 1000L) != MVI_SUCCESS)
printf("Semicolon could not be sent in 1 second\n");
See Also:
MVIsp_GetCh
MVIsp_Puts
MVIsp_PutData
Publication 1756-RM004B-EN-P - October 2000