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Names and Functions of Parts
FP2−CCU
2 − 5
2.1 Names and Functions of Parts
2.1.3 COM.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 Equipment Ready ER
Unit → External device
(9−pin internal)