The communication modules that worked with the TDS210 are no longer available for sale, It has been close to 20 years since we offered them. There might be a chance to find a used one searching the web.
Here is information on the modules.
TDS2CM or TDS2CMA version CMV:v1.04 and above, or TDS2MM any
version, when used in TDS210 and TDS220 instruments with FV:v1.09 and
above.