PPC-E4+ User Manual.doc
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Rev 1.4 © 2015 EMAC, Inc.
2.2
Power Connectors
The SoM-212 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 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 SoM-
212’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 SoM-212 from 5V DC use either the JK1 or Pin #1 on CN1.
To power the SoM-212 from 8V to 36V DC use Pin #4 on CN1.
Alternatively the SoM-212 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+ 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 AT91SAM9G45 processor and the Micrel KSZ8041 performs the PHY responsibilities. Activity and Link
LEDs are integrated into the RJ45 connector.
2.4
Serial Ports
The PPC-E4+ 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.
COM D is an RS232 port. This port offers the RTS and CTS handshake lines.
