Puerto serie (COM 25)
(Conector D-sub de 25 pines)

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Pin	Nombre	Entrada / Salida	Significado
1	GND	-	Shield Ground
2	TxD	Salida	Transmit Data
3	RxD	Entrada	Receive Data
4	RTS	Salida	Request To Send
5	CTS	Entrada	Clear To Send
6	DSR	Entrada	Data Set Ready
7	GND	-	Ground
8	DCD	Entrada	Data Carrier Detect
9	-	-	RESERVED
10	-	-	RESERVED
11	STF	Salida	Select Transmit Channel
12	S.CD	Entrada	Secondary Carrier Detect
13	S.CTS	Entrada	Secondary Clear to Send
14	S.TXD	Salida	Secondary Transmit Data
15	TCK	Entrada	Transmission Signal Element Timing
16	S.RXD	Entrada	Secondary Receive Data
17	RCK	Entrada	Receiver Signal Element Timing
18	LL	Salida	Local Loop Control
19	S.RTS	Salida	Secondary Request to Send
20	DTR	Salida	Data Terminal Ready
21	RL	Salida	Remote Loop Control
22	RI	Entrada	Ring Indicator
23	DSR	Salida	Data Signal Rate Selector
24	XCK	Salida	Transmit Signal Element Timing
25	TI	Entrada	Test Indicator