FX30s RS-485 port in Legato 21

I am bit confused about the actual RS-485 port on the FX30s. I have updated this to R15 Legato version 21


lrwxrwxrwx 1 root root 9 Jan 1 1970 ttyAT → /dev/smd8
crw-rw---- 1 root dialout 244, 0 Jan 6 09:35 ttyMSM0

Is this the correct port for RS-485 for UART1. I used to use the device /dev/HSL0 in my curreent application but when I upgraded it to Legato 21 and fx30s_catm_4_1_0 release, I see /dev/MSM0 now. Did something change ?

you can see here: