OK, so lets say I'm being sent $ab and I need it to be placed in a variable a0.

HSERIN [HEX4 a0]

This will place the hex value of $ab into a0, correct?

What if I'm recieving several bytes such as $aa $ab $ac $ad etc etc and I want them in a1 a2 a3 a4 etc?

HSERIN [HEX4 ao, a1, a2, a3, a4]
or do I need multiple lines?
HSERIN [HEX4 a0]
HSER [HEX4 a1] etc etc.