IBM PCM-6890B manual Serial ports CN16, COM 1-4 RS-232/422/485 serial ports CN16

Serial ports (CN16)

The PCM-6890B offers four serial ports, three RS-232 and one RS- 232/422/485. These ports allow you to connect them to serial devices (mouse, printers, etc.).

COM 1-4 RS-232/422/485 serial ports (CN16)

COM1, COM2, COM3, COM4 RS-232/422/485 serial port

	PIN	SIGNAL	PIN	SIGNAL
COM1	1	DCDa	2	DSRa
	3	RXDa	4	RTSa
	5	TXDa	6	CTSa
	7	DTRa	8	RIa
	9	GND	10	N.C.
COM2	11	DCDb	12	DSRb
	(422TXD-/485DATA-)
	13	RXDb	14	RTSb
		(422RXD+)
	15	TXDb	16	CTSb
	(422TXD+/485DATA+)
	17	DTRb	18	RIb
		(422RXD-)
	19	GND	20	N.C.
COM3	21	DCDc	22	DSRc
	23	RXDc	24	RTSc
	25	TXDc	26	CTSc
	27	DTRc	28	RIc/+5V/+12V
	29	GND	30	N.C.
COM4	31	DCDd	32	RSRd
	33	RXDd	34	RTSd
	35	TXDd	36	CTSd
	37	DTRd	38	RId/+5V/+12V
	39	GND	40	N.C.

34 PCM-6890B User Manual