8030-CRM-210. The Symax Class 8030 Type CRM-210 Local / Remote Interface. The local and remote interface (L1 and R1) system for the Symax programmable controller family provides a versatile method of handling a wide variety of local and remote I/O and register module configurations. It has the interfacing capability to handle everything from the smallest single task machines to systems requiring thousands of remote I/O and register functions. By utilizing the Symax and R1 modules, both digital and register racks can be located remotely from a Symax processor. The modules allow communication with the processor over a two pair, twisted, shielded cable, greatly reducing the cost of control wiring to the remote electrical inputs and outputs.