UART1 can receive date but can not send (TX not working)

i’m using BBBW to receive GPS signal, i enable uart1 and using following commands:
config-pin P9.24 uart
config-pin P9.26 uart
stty -F /dev/ttyO1 -echo 115200
after doing that i used minicom and the signal date can be seen, but only received.
the problem is, that i need to send the date to another devices, but there is no date in Pin 24.
How can i solve this ? Thanks in advance