IAI America RCP2-CF - Manual (Page 139)

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[2] Link-connection terminal block (TB1)
A connection port for linking the controller.
“A” on the left side connects to pin 1 (SGA) in the controller’s communication connector.
“B” on the right side connects to pin 2 (SGB) in the controller’s communication connector.
(Note)
Be sure to use twisted pair wires for the above two connections (SGA/SGB).
[3] D-sub, 9-pin connector
A connection port with the host PC or PLC’s communication module.
[4] Mini DIN, 8-pin connector
A connection port with the teaching pendant.
[5] PORT switch
A switch for enabling/disabling the teaching pendant.
Set the switch to ON when a teaching pendant is used, or OFF when teaching pendant is not used.
[6] Monitor LEDs
LED1 --- Lit when the controller is transmitting
LED2 --- Lit when the RS232 is transmitting