You can select to pair RPCM to Modem or Reader.
For the details of pairing with Modem, please refer to RPCM Supporting Modem User Manual: How to Deploy Section 2 Pair RPCM to Modems via KLM.
For the details of pairing with Reader, please refer to RPCM Supporting Reader User Manual: How to Deploy Section 1 Pair RPCM to Readers via KLM.