Digi EIA-422 Installing the EtherLite Hardware, Rack Mount Considerations, EIA 232 Connectors

Installing the EtherLite Hardware

1.Write the MAC address of the EtherLite module on the following line. It will be needed during software installation. This address is printed on a label next to the power plug at the back of the unit.

MAC Address # 00AOE7______________

2.Connect the Ethernet cable to the unit using the RJ-45 jack labeled 10BASE-Tor 10/100BASE-Tlocated on the front of the cabinet. Use the provided straight-through cable to connect the unit to a hub. Connecting directly to an Ethernet card will require a 10Base-T crossover cable (not provided). Note that either wiring scheme requires that the twisted pairs be used for specific pairs of pins: 1&2, 3&6, 4&5, and 7&8.

Rack Mount Considerations

When doing a rack mount installation consider the following:

• Cumulative power requirements of the unit and other equipment

installed in the rack. Do not overload rack supply circuits.

• Safety and stability. Always stack the rack from bottom up to ensure

a stable and safe rack.

Note: The EtherLite 32 weighs 5.8 lbs (2.6 kgs).

• Air flow in the rack. Make sure the unit’s ambient temperature does

not exceed 95°F (35°C).

• Grounding. Earth ground the unit reliably to the rack system. The

earth ground connection must be maintained when the supply con-

EIA-232 DTE Pinouts

EtherLite	Signal	DB-25 Pin	DB-9 Pin
RJ-45 Pin
1	RTS (out)	4	7
2	DSR (in)	6	6
3	DCD (in)	8	1
4	RxD (in)	3	2
5	TxD (out)	2	3
6	GND	7	5
7	DTR (out)	20	4
8	CTS (in)	5	8

RJ-45 Pinouts

Straight-through

Pin to Pin

1 to 1

2 to 2

3 to 3

4 to 4

5 to 5

6 to 6

7 to 7

8 to 8

Crossover

Pin to Pin

1 to 3

2 to 6

3 to 1

4 to 4

5 to 5

6 to 2

7 to 7

8 to 8

Pin 1 Pin x

RJ-45 Plug

nection is other than a direct connection to the branch circuit.

EIA - 232 Connectors

Many EIA-232 serial devices implement their serial ports with DB-25 connectors. The EtherLite units have serial ports implemented with 8-pin RJ-45 modular jacks, with each signal using EIA-232 voltage levels. The figures below shows the pinouts of all these connector types.

1		13
14	25		Pin 1	Pin x

IMPORTANT: RJ-45 cables designed for other Digi products must not be used with Digi EtherLite and SCSI Terminal Server products. The EtherLite RJ-45 pin configuration differs from the configuration of the RJ-45 connectors used on other Digi products. The table above shows the different signals, along with the standard DB-25, DB-9 and the EtherLite 8-pin RJ-45 pinout.

The most convenient method of mating DB-25 and DB-9 serial devices to your EtherLite Port Server is to use RJ-45 to DB-25 and RJ-45 to DB- 9 adapters. This allows the DTE/DCE selection to occur at the adapter, while using “straight-through” modular cables. To assure CE (Conformité Européenne) mark compliance (Europe), all serial cables must be shielded. The following RJ-45 to DB-25 adapters are available from Digi International, along with two-meter unshielded straight-

3.Assign an IP address to the EtherLite module.

You will need to go to the software installation procedures on the Access Resource CD for information on how to assign an IP address.

Male DB-25

through modular cables:

Rack Mount Installation

For the EtherLite 32, a rack mount kit is included. The rack mount brack- ets may be installed at either the front or rear of the unit.

To install each bracket, do the following:

1.Remove the two screws on the side of the cabinet.

CAUTION: To prevent electric shock, do not remove the module cover. There are no user-serviceable parts inside. Refer servicing to qualified personnel only.

2.Align the countersunk holes of the bracket with the vacated holes in the cabinet. Use the countersink screws to fasten the bracket to the cabinet.

13 1

RJ-45 Plug

25 14

Female DB-25

RJ-45 to DB-25 Adapters

P/N 76000450

(DTE to Modems)

RJ-45	Signal	DB-25
Jack		Male
1	RTS	4
2	DSR	6
3	DCD	8
4	RxD	3
5	TxD	2
6	GND	7
7	DTR	20
8	CTS	5

P/N 76000451

(DCE to Terminals/Printers)

RJ-45	Signal	DB-25
Jack		Male
1	RTS	5
2	n/c	6
3	DCD	20
4	RxD	2
5	TxD	3
6	GND	7
7	DTR	8
8	CTS	4