FP2−CCU | Names and Functions of Parts |
2.1 Names and Functions of Parts
2.1.3COM.1 and COM.2 Ports (9 Pins)
These are used to connect the RS232C connector of an RS232C device such as a personal computer or display panel, using a shielded cable.
Pin layout
| Pin No. | Name | Mnemonic | Signal direction |
| 1 | Frame Ground | FG | — |
| 2 | Send Data | SD | Unit → External device |
| 3 | Receive Data | RD | Unit ← External device |
| 4 | Request to Send | RS | Unit → External device |
| 5 | Clear to Send | CS | Unit ← External device |
| 6 | (Not used) | — | — |
| 7 | Signal Ground | SG | — |
| 8 | Receive Carrier Detect | CD | Unit ← External device |
(9−pin internal) | 9 | Equipment Ready | ER | Unit → External device |
2 − 5