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CN 31 : SM bus port
Pin Number Pin function Ps.
1 I2CSCL
clock pin of SM bus for
smart battery
2 GND
3
I2CSDA data pin of SM bus for
smart battery
4
nDC_IN This pin is pulled low on
PCM-7230 by 2M ohm.
3.1.4 COM1~COM4 serial ports
The PCM-7230 offers four full-functions RS-232 (COM1, COM2, and COM3) and
one RS-485 w/ AFC (COM5) serial communication interface ports.
¾ Automatic Data Flow Control Function for RS-485
The RS-485 in PCM-7230 will automatically sense the direction of incoming data and
switch its transmission direction accordingly. Therefore no handshaking signal (e.g.
RTS signal) is necessary. This feature lets users build an RS-485 network simply and
quickly with just two wires. More importantly, application software previously
written for half duplex RS-232 environments can be maintained without need for
modification.
3.1.5 LAN: Ethernet Connector(CN9,Pin1~Pin6)
The PCM-7230 is equipped with one Davicom DM9000 10/100 Base-T Ethernet
LAN controller. The second and third LED indicators (approach AMI-120 Interface)
on board show the Link and Active (Green LED) status of this Ethernet port.
3.1.6 USB client connector(CN9,Pin47~Pin50)
This USB client connector is used to communicate with PC for ActiveSync. Users
may connect the PCM-7230 with PC to develop their own applications and download
files to PCM-7230.
3.1.7 DC power connector(CN29)
The DC power connector carries 12 VDC external power input and features reversed
wiring protection. Therefore, it will not cause any damage to the system by reversed
wiring of ground line and power line.
3.1.8 LCD display connector(TTL level:CN18 ; LVDS:J1)
This 40-pin LCD display connector is for LCD connectivity.