Digi Switch 90000278_B User Manual

Hardware Reference Manual  
Digi One EM  
90000278_B  
 
Contents  
Chapter 2 About the Digi One EM  
Chapter 3 About the Development Board  
DB-9 Serial Interface (P1) .............................................................15  
Reset Switch (SW1).......................................................................16  
Power Jack (P7) .............................................................................17  
LEDs (CR4 - CR11) .....................................................................18  
Digi One EM Hardware Guide  
3
 
Chapter 1  
I n t r o d u c t i o n  
About This Guide  
Purpose  
The purpose of this guide is to enable developers to integrate  
the Digi One EM into other devices, enabling these devices to  
make use of the Digi One EM’s rich networking features.  
Audience  
Scope  
This document is written for developers tasked with  
integrating Digi One EM device servers into other devices.  
This document provides the information required for electrical  
integration of the Digi One EM into another device. It does  
not address how to configure or administer the device server  
or how to write applications to use its functionality. These  
topics are covered in other documents in the library.  
Digi One EM Hardware Reference  
5
 
   
Introducing the Digi One EM  
Product Overview  
The Digi One EM is part of the Digi One Family of single port  
device servers that provide simple, reliable and cost-effective  
network connections for serial devices. The Digi One EM  
provides fully transparent serial device connectivity over  
industry-standard Ethernet connections and allows both  
equipment manufacturers and systems integrators to  
network-enable products at a fraction of the time and cost  
required to develop a custom solution. It is a highly flexible  
and compact single component solution with a robust on-  
board TCP/IP stack and 10/100 Base-T Ethernet support.  
From medical systems to building control and industrial  
automation, in virtually any application where embedded  
serial connectivity over Ethernet is needed, the Digi One EM  
is the ideal choice, delivering high-performance functionality.  
Cautions  
To guard against damage to the Digi One EM due to elec-  
trostatic discharge (ESD), do not remove it from its pro-  
tective packaging until you have been properly grounded.  
To ground yourself, put the wrist strap on (included in the  
package) and then attach the clip to a metal surface.  
• Input voltage for the Digi One EM must be in the range of  
5VDC to 9VDC.  
6
Digi One EM Hardware Reference  
 
 
Support Information  
To get help with a question or technical problem or to make  
comments and recommendations about our products or  
documentation, use the following contact information.  
General  
Digi International  
11001 Bren Road East  
Minnetonka, MN 55343  
U.S.A  
Customer Service and Support  
United States: 1 877-912-3444  
Other Locations: 1 952-912-3444  
Digi One EM Hardware Reference  
7
 
 
Chapter 2  
A b o u t t h e D i g i O n e E M  
Digi One EM Drawing  
The following figure shows the Digi One EM layout and  
dimensions.  
8
Digi One EM Hardware Reference  
 
   
Connectors: Power and Serial Interface (P4)  
The Digi One EM has a single 12-pin, serial interface port  
(labeled P4) that supports EIA-232 (TTL levels only), data  
rates up to 230 Kbps and full-modem control. The following  
figure helps you locate pins, and the table helps you identify  
which signal uses each pin.  
Pin  
Signal Name  
Description  
+5VDC to  
+9VDC (input  
only)  
1
Input power to Digi One EM  
2
GND  
Reference Ground for input power  
Receive Data (input)  
Transmit Data (output)  
Request To Send  
Data Terminal Ready  
Clear To Send  
3
RxD  
4
TxD  
5
RTS  
6
DTR  
7
CTS  
8
DCD  
Data Carrier Detect  
Data Set Ready  
Reset  
9
DSR  
10  
11  
12  
RST~  
Reserved  
Reserved  
Not used  
Not used  
Digi One EM Hardware Reference  
9
 
 
Connectors: Ethernet Interface (P1)  
The Digi One EM Ethernet connector is an eight-wire, RJ-45  
jack meeting the requirements of ISO 8877 for 10/100Base-  
T. The following figure helps you locate pins and the table  
helps you identify which signal uses each pin.  
Pin  
Signal Name  
1
2
3
4
5
6
7
8
TxD+ (Transmit Data)  
TxD- (Transmit Data)  
RxD+ (Receive Data)  
Not used  
Not used  
RxD- (Receive Data)  
Not used  
Not used  
10  
Digi One EM Hardware Reference  
 
 
Reset Switch  
The reset switch, located between P3 and CR1, does the  
following (depending on how long you hold the switch down):  
• It reboots the Digi One EM if you press and release the  
switch immediately.  
• It reboots the Digi One EM and restores the configuration  
to factory defaults. (Press and hold the switch down for  
about 20 seconds while powering the Digi One EM up.)  
LEDs  
Digi One EM LEDs provide information on port activity,  
diagnostics, and Ethernet activity.  
LED  
Color  
Function  
Interpretation  
Off means that the serial  
channel is idle.  
Blinking indicates an  
active connection.  
Indicates serial  
port activity  
Top left  
Green  
Off means that no link  
has been detected.  
On means that a link  
has been detected.  
Top  
right  
Network link sta-  
tus  
Green  
Digi One EM Hardware Reference  
11  
 
   
LED  
Color  
Function  
Interpretation  
Blinking 1-1-1 means  
starting the operating  
system.  
Blinking 1-5-1 means  
configuration has been  
returned to factory  
defaults.  
Bottom  
left  
Red  
Diagnostics  
Steady blinking means  
the device is seeking an  
IP address from a  
DHCP server.  
Note: If other blinking  
patterns occur, call Digi  
Technical Support.  
Bottom  
right  
Yellow  
Reserved  
NA  
12  
Digi One EM Hardware Reference  
 
Chapter 3  
Overview  
The development board provides the following interfaces:  
• A DB-9 serial interface that enables serial connections  
from your device to the Digi One EM module. See "DB-9  
Serial Interface (P1)" on page 15.  
• A 12-position socket to supply both power and ground to  
the Digi One EM.  
• A reset switch to reboot the Digi One EM. See "Reset  
• A standard 2.0 mm jack that accepts 5 volts DC +/- 5%  
from a regulated power supply. See "Power Jack (P7)" on  
page 17.  
Eight LEDs. One (labeled CR4) tells you if the power is  
on. The other seven (labeled CR5 - CR11) are active  
when EIA-232 signals are detected. See "LEDs (CR4 -  
CR11)" on page 18.  
• A reserved 3-pin header (labeled P5)  
Cautions  
• Although the Digi One EM can handle up to 9 VDC, this  
voltage can harm the development board, which works  
only with the 5 volt regulated power supply. The board  
does not regulate power.  
To guard against damage to the development board due  
to electrostatic discharge (ESD), do not remove it from its  
protective packaging until you have been properly  
grounded. To ground yourself, put the wrist strap on  
(included in the package) and then attach the clip to a  
metal surface.  
Digi One EM Hardware Reference  
13  
 
     
Development Board Illustration  
14  
Digi One EM Hardware Reference  
 
 
DB-9 Serial Interface (P1)  
The following figure helps you locate specific DB-9 pins and  
the table maps signals to pins.  
Pin 5  
Pin 9  
Pin 1  
Pin 6  
Pin  
Signal  
1
2
3
4
5
6
7
8
9
Data Carrier Detect (DCD)  
Receive Data (RxD)  
Transmit Data (TxD)  
Data Terminal Ready (DTR)  
Signal/Chassis Ground (GND)  
Data Set Ready (DSR)  
Request To Send (RTS)  
Clear To Send (CTS)  
Unused  
Digi One EM Hardware Reference  
15  
 
 
Reset Switch (SW1)  
The reset switch reboots the Digi One EM.  
16  
Digi One EM Hardware Reference  
 
 
Power Jack (P7)  
The power jack accepts 5 volts DC +/- 5% from a regulated  
power supply. The development board is polarity sensitive.  
The +5 volts is assumed to be the center contact on  
connector, and the ground is the outside of the connector  
barrel, as shown in the following figure.  
Digi One EM Hardware Reference  
17  
 
 
LEDs (CR4 - CR11)  
The LED labeled CR4 is a power indicator. The other seven  
LEDs display EIA-232 signal activity. The following table  
describes the specific signal associated with each LED.  
LED  
Signal  
CR5  
Tx (Transmit Data)  
CR6  
CR7  
CR8  
CR9  
CR10  
CR11  
Rx (Receive Data)  
CTS (Clear to Send)  
RTS (Request to Send)  
DTR (Data Terminal Ready)  
DSR (Data Set Ready)  
DCD (Data Carrier Detect)  
18  
Digi One EM Hardware Reference  
 
 
Chapter 4  
S a m p l e A p p l i c a t i o n : T T L S i g n a l s t o  
E I A - 2 3 2  
The following figure is an example of how to convert the Digi  
One EM signals to normal serial voltage levels.  
9
D B  
2
1
Digi One EM Hardware Reference  
19  
 
 
Appendix A D i g i O n e E M S p e c i f i c a t i o n s  
Network Interfaces  
• RJ-45 connector  
• 10/100Base-T  
• Half- and full-duplex support  
Serial Interface  
One TTL EIA-232 serial interface  
Data Rates (bps)  
110, 134, 150, 200, 300, 600, 1200, 2400, 3600, 4800, 9600,  
19200, 38400, 57600, 115200, 230400  
Modem Control  
DTR, DSR, DCD  
Flow Control Options  
RTS/CTS, DTR/DSR, XON/XOFF, None  
Environmental  
• Operating Temperature: 50 0F to 131 0F (10 0C to 55 0C)  
• Humidity: 5% to 90%  
• Altitude: 12,000 feet (3657.60 meters)  
Power Requirements  
+5VDC @ 370 mA to 9VDC @ 230 mA typical  
Mechanical  
• Length: 1.93 inches (49.02 millimeters)  
• Width: 1.57 inches (39.87 millimeters)  
• Height: 0.974 inches (24.73 millimeters)  
20  
Digi One EM Hardware Reference  
 
                 
Appendix B D i g i O n e E M C e r t i f i c a t i o n s  
This product complies with the following standards:  
FCC Part 15 Class A  
Radio Frequency Interference (RFI) (FCC 15.105)  
This equipment has been tested and found to comply with the  
limits for Class A digital devices pursuant to Part 15 of the  
FCC Rules. These limits are designed to provide reasonable  
protection against harmful interference in a residential  
environment. This equipment generates, uses, and can  
radiate radio frequency energy, and if not installed and used  
in accordance with the instruction manual, may cause  
harmful interference to radio communications. However,  
there is no guarantee that interference will not occur in a  
particular installation. If this equipment does cause harmful  
interference to radio or television reception, which can be  
determined by turning the equipment off and on, the user is  
encouraged to try and correct the interference by one or more  
of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and the  
receiver.  
• Connect the equipment into an outlet on a circuit different  
from that to which the receiver is connected.  
• Consult the dealer or an experienced radio/TV technician  
for help.  
Labeling Requirements (FCC 15.19)  
This device complies with Part 15 of FCC rules. Operation is  
subject to the following two conditions: (1) this device may  
not cause harmful interference, and (2) this device must  
accept any interference received, including interference that  
may cause undesired operation.  
Digi One EM Hardware Reference  
21  
 
   
Modifications (FCC 15.21)  
Changes or modifications to this equipment not expressly  
approved by Digi may void the user’s authority to operate this  
equipment.  
ICES 003 Class A  
This Class A digital apparatus meets the requirements of the  
Canadian Interference-Causing Equipment Regulations.  
Cet appareil numérique de la Classe A respecte toutes les  
exigences du Règlement sur le matériel brouilleur du  
Canada.  
Product Safety  
• UL 60950  
• EN60950  
• CSA 22.2 No. 60950  
22  
Digi One EM Hardware Reference  
 
   
Digi One EM Hardware Reference  
 
Digi One EM Hardware Reference  
 

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