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| RRRA | RRS | RRSP | RRT | RRV | RRX |
| RRY | RS | RS-232 | RS-232C | RS-422 | RS-423 |
| RS232 | RSA | RSAA | RSAI | RSAS | RSBP |
| RSC | RSCC | RSCP | RSD | RSDL | RSDP |
| RSDS | RSE | RSEA | RSFC | RSG | RSGB |
| RSHMI | RSI | RSJ | RSK | RSL | RSM |
| RSMAS | RSMC | RSMIS | RSN | RSO | RSP |
| RSPC | RSPL | RSPM | RSQ | Rsr | RSRD |
| RSRG | RSS | RSSI | RSSSF | RST | RSU |
| RSV | RSVC | RSVP | RT | RTA | RTAC |
| RTAFA | RTANG | RTAP | RTAS | RTB | RTBT |
| RTC | RTCA | RTCC | RTCI | RTCON | RTCSA |
| RTCVD | RTD | RTE | RTEP | RTF | RTFA |
| RTFB | RTFP | RTH | RTI | RTL | RTLT |
| RTM | RTMM | RTN | RTO | RTOC | RTOS |
| RTP | RTPC | RTPG | RTPL | RTPR | RTPS |
| RTPW | RTR | RTRP | RTS | RTSA | RTSC |