Powering Up the PCM-53E52
The PCM-53E52’s power connector (CN1) is a standard floppy, four-pin type connector commonly found
on most PC type power supplies. The PCM-53E52’s logic only requires 5 volts DC. The 12v pin (HDR6
pin 4) is routed to the PC/104 connectors and may be used by some PC/104 expansion cards. The pin-
out for the HDR6 power connector is as follows:
Pin
Signal
1
+5 V
2
GND
3
GND
4
+12 V
Remember
before powering-up the PCM-53E52 make sure the DOC is correctly orientated, firmly
seated and check any cables to make sure that plugged on and correctly in relation to pin 1.
Note:
The PCM-53E52 requires less than 2 amps which is not enough current to load the main switcher
in some larger PC power supplies (this can be verified with a voltmeter measuring the 5-volt supply). If
this is the case you can try to load the power supply by adding 5-volt devices, or order a compatible
power supply from EMAC.
Ethernet
The PCM-53E52 utilizes the RTL 8139 10/100 BaseTX full duplex Ethernet chip and terminates to a
standard RJ-45 connector (JK1). It can be connected straight to a Hub, Switch or directly to another
computer via a crossover Ethernet cable. Link and Activity (Rx/Tx) LEDs (LD2) are provided to monitor
network activity.
Serial Ports
The PCM-53E52 is equipped with four serial ports. All four serial ports are standard X86, 16550, 16 byte
FIFO UARTS.
COM1 is set to be RS232 and is configured by default to 3F8H using IRQ 4. Availability is via the DB9
(CN1) connector on the edge of the board.
COM2 is jumper configurable to run RS232 or RS422/485 and is set by default to I/O address 2F8H using
IRQ 3. This comport is available via a DB9 connector (CN2). The mode is switched using JP4, if the
jumper is present it will run RS422/485.
COM3 and COM4 are both configured as RS232 ports. These are available to the user on connectors
HDR7 & HDR5 respectively. The default I/O address and IRQ for COM3 is 3E8H using IRQ 5 and the
default I/O address for COM4 is 2E8H using IRQ 11.
NOTE: COM4 DOES NOT OFFER HANDSHAKING AND IS LIMITED TO RXD AND TXD DUE TO PIN
FUNCTION TRADEOFFS AT THE SUPER I/O CHIP. SELECT FUNCTIONS FROM COM3 AND COM4
SHARED THRU ONE INTERFACE DRIVER CHIP.
