Hi
Depending on how exactly the rs485 is implemented and how much the serial protocols between the two series differ it is easy or
you are writing a complete new driver.
RS485 is normally the way to connect multiple devices to a pc with one cable.
These instruments need an addres to differentiate between them. So mostly an addres is added in the beginning of the command.
Sometimes RS485 is a hardware replacement for rs232 to achieve longer distances between instrument and pc only.
This should be called rs422 and only the levels and wiring are different from rs232, normally the commands (syntax) is identical to rs232.
So you see, a lot of options that easily can be detected by comparing the driver with your manual (if the manual is written correct).
Good luck.
greetings from the Netherlands