The following metal case 2100-IS can be used with RS485

Note:

Comms terminals 70-74.
Dip Switch S2 linked for 485 1,2,3,4 ON

This converter will work with 485 2100-XX stations, but should not be used with non microscan Modbus RTU devices as it does not have the fast TXE delay control that the newer 2100-IS has.