Dell Edge Gateway 5200 User's Guide

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COM port connectors

The EGW-5200 provides four COM ports through D-sub 9-pin connectors. The COM1 and COM2 ports support RS-232/422/485 modes by BIOS setting, while COM3 and COM4 are located on the uFM modules and support only RS- 232.

COM port pin locations — Figure 1. COM port pin locations

Table 1. D-Sub 9-pin signal function of COM portsD-Sub 9-pin signal function of COM ports
Pin	Signal
Pin	RS-232	RS-422	RS-485
1	DCD#	TXD422–	485DATA–
2	RXD	TXD422+	485DATA+
3	TXD	RXD422+	N/S
4	DTR#	RXD422–	N/S
5	GND	N/S	N/S
6	DSR#	N/S	N/S
7	RTS#	N/S	N/S
8	CTS#	N/S	N/S
9	RI#	N/S	N/S

Table 2. RS232 COM1 and COM2 specificationsRS232 COM1 and COM2 specifications
Parameter	Min	Typ	Max	Units	Note
Baud rate	–	–	115,200	bps	–
VO	±5	±5.5	–	V	No load = ±7 V max
VIH		1.8	2.4	V	–
VIL	0.8	1.5	–	V	–
Receiver input impedance	3,000	–	7,000	ohm	–
Load capacitance	–	–	2,500	pF	Includes receiver input
Slew rate	–	–	30	V/us	–

Table 3. RS422 COM1 and COM2 specificationsRS422 COM1 and COM2 specifications
Parameter	Min	Typ	Max	Units	Note
Baud rate	–	–	115,200	bps	–
VOD	2	–	5	V	RL = 100 ohm
VIH	–	–	10	V	–
VIL	–200	–	–50	mV	–
Receiver input resistance	–	–	4,000	ohm	–

Table 4. RS485 COM1 and COM2 specificationsRS485 COM1 and COM2 specifications
Parameter	Min	Typ	Max	Units	Note
Baud rate	–	–	115200	bps	–
VOD	1.5	–	5	V	RL = 54 ohm
VIH	–	–	10	V	–
VIL	–200	–	–50	mV	–
Receiver input resistance	–	–	12,000	ohm	–

Table 5. RS232 COM3 and COM4 specificationsRS232 COM3 and COM4 specifications
Parameter	Min	Typ	Max	Units	Note
Baud rate	–	–	115,200	bps	–
VO	±5	±9	–	V	All transmitter outputs loaded with 3 kΩ to ground Output resistance 300 Ω VCC = 0 V, VOUT = ±2 V
VIH	–	2	2.4	V	TA = 0°C to 85°C
VIL	0.8	1.3	–	V
Receiver input impedance	3	5	7	Kohm
Load capacitance	50	–	2,500	Pf	Between the clamp and the cable
Slew rate	–	8	–	V/us	–