Terminal messages on 2509

I'm using a terminal access 2509 which is connected to 2x 1841 ISR and to my network switch (Planet layer 2). due to mismatch in the duplex and speed (the 2509 is connected to my switch with transceiver) i'm always getting a mismatch error in the terminal screen. how can i avoid or disable this message on my terminal?
how can i shutdown messages from appear on my terminal?

On Cisco devices you can use the command no logging console. Have you tried to hard code your speed and duplex on both ends to fix your mismatch errors?

Well my 2509 terminal access is connected through a transceiver (which has 10Mbps interface) to a Layer-2 switch (with no managment) so i can't hard code the speed on either one of them.
i will try the no logging console command.
Thanks!