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In pmaxd you will find two lines :
options.c_cflag |= (CLOCAL | CREAD | CS8 );
options.c_cflag &= ~(PARENB | CSTOPB | CSIZE);

Looking at the values for these constants in /usr/include/asm-generic/termbits.h
CS8 0000060
CLOCAL 0004000
CREAD 0000200
Or'ed together = 0004260

options.c_cflag &= ~(PARENB | CSTOPB | CSIZE);
PARENB 0000400
CSTOPB 0000100
CSIZE 0000060
Or'ed together= 0000560
Negated = FFFFA9F

So the bitwise AND of the second line is ANDing the 6 (sixth digit) with the 9 giving 0 ... which resets the two bits that are used for the character set leaving you with CS5 (which is defined as 0000000 in the include file).

Solution - edit pmaxd.c and swap these two lines over.