PPC-E4-3354_User_Manual.docx
-8-
Rev 1.0 © 2016 EMAC, Inc.
2.2
Power Connectors
The PPC-E4-3354 provides two power connectors. CN1 is a standard four-pin type, PC floppy disk power
connector that mates with standard floppy disk drive power connectors. Using this power input provides for a
more rugged/industrial polarized locking connection. JK1 is a standard 5.5mm barrel jack with an inner diameter
of 2.1mm with a center V+ connection. This jack allows for easy connection to a 5V DC wall mount power supply
(EMAC part number PER-PWR-00032). The PPC-E4-3354
’s power input uses a switching regulator and allows a
voltage input of +5V DC to 36V DC only if you are using the CN1 power connector.
NOTE: If using JK1 a 5V DC
supply must be used.
To power the PPC-E4-3354 from 5V DC use either the JK1 or Pin #1 on CN1.
To power the PPC-E4-3354 from 8V to 36V DC use Pin #4 on CN1.
Alternatively the PPC-E4-3354 can be power from a Power Over Ethernet (POE) Switch
provided the SoM-212 POE option is installed.
The pinout for the CN1 power connector is as follows:
Pin
Signal
1
+5V DC
2
Chassis GND
3
Chassis GND
4
+Vin DC (+8 to +36V)
Note: Do not drive both the +5V and the +Vin power inputs. Drive one or the other.
2.3
Ethernet
The PPC-E4-3354 provides 10/100 Base-T full duplex Ethernet and uses a standard RJ-45 connector. It can be
connected straight to a hub, or another computer via a crossover Ethernet cable. The Ethernet MAC is integrated
into the AM3354 ARM
Cortex-A8 processor and the Micrel KSZ8041NL performs the PHY responsibilities. Activity
and Link LEDs are integrated into the RJ45 connector.
2.4
Serial Ports
The PPC-E4-3354 is equipped with three dedicated RS232 ports, all of which terminate to 10-pin header
connectors (see Table 4, 5, & 7 below) and a RS232/422/485 port (Table 6). Four 10-pin header-to-male DB9
connector cables are provided, giving easy access to these ports. Baud rate, stop bits, etc. are all programmable
for each port via software.
COM A is an RS232 compatible port with a full complement of handshaking lines allowing it to communicate with
modems and other devices requiring hardware flow control.
COM B is an RS232 port (Console Port). This port offers the RTS and CTS handshake lines.
COM C can be configured to RS232, RS422, and RS485 via four software controlled port pins (see table 3
below). To select RS232 set SoM pin 109 & 120 Low and pin 118 & 119 High (this is the default). For RS422 set
SoM pin 109 & 120 High and pin 118 & 119 Low. To select RS485, selectively set SoM pin 109 & 119 as required
while keeping pin 118 Low. The processor provides for Auto 485 by having the transmitter automatically turned on
when required, eliminating the need to manually control this line via RTS (see processor manual).
When using COM C in the RS422/485 mode, a terminating resistor (~120 Ohm) is recommended on the two far
ends of the network. JP7 moved to the TRM position will terminate the receiver with 124 ohms. For more
information on serial ports and software configuration go to:
http://wiki.emacinc.com/wiki/Example_serport212
