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User’s Manual for Advantech SOM-A2552 series module V1.00
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According to user target CSB demand, user could define COM5 as 3-wire
(RX, TX, RTS) RS-232 port or pass through RS-485 transceiver to act as
RS-485 function. User could references “Advantech SOM-A255x series CSB
design guide “to design the COM5.
2.2.3 USB 1.1 Host
SOM-A255F & SOM-A2558 series supports 2 USB host ports.
SOM-A2552 series supports 1 USB host port. The USB host ports on the
SOM-A255x are USB 1.1 compatible. The default Windows CE.NET and Linux
on board support USB keyboards, mice and mass storage devices. User could
check the " SOM-A255x series verified compatible peripherals list " to know the
verified compatible peripherals. If user wants to connect other devices, it may
take customization on the Windows CE.
2.2.4 USB 1.1 client
The USB client port on the SOM-A255x is USB 1.1 compatible. USB client
connector is used to communicate with master device (ex: PC) for ActiveSync.
About SOM-A255x series ActiveSync installation, please reference to
“Installation Guide-Advantech RISC platform with Microsoft ActiveSync 3.7”.
2.2.5 T/S
SOM-A255x series supports 4-wires (X+, X-, Y+, Y-) resistive T/S
interface.
2.2.6 PCMCIA/CF
All SOM-A255x series supports 2 PCMCIA interface (I/F) or 2 CF I/F or 1
PCMCIA & 1 CF I/F. User could check “ SOM-A255x Series Carrier Board
Design Guide “ to know how to design the I/F.
PCMCIA/CF I/F power control circuit is designed on SOM module, so
PCMCIA/CF I/F is hot-swappable.
Advantech strongly suggest user to design one CF or one PCMCIA
slot on user’s target carrier board, even user doesn’t need this port in
target product. Advantech platform always use CF or PCMCIA slot to be
system S/W upgrading port. If user doesn’t design 1 CF or PCMCIA slot
on carrier board, user will run into trouble when user wants to upgrade
image, boot loader & boot-logo.
2.2.7 SD/MMC
All SOM-A255x series supports 1 slot SD/MMC port. The Multi Media
Card (MMC) is a low cost data storage and communication media. The MMC
controller in the SOM-A255x is compliant with The Multi Media Card System
Specification, Version 2.1. The only exception is one and three byte data
transfers are not supported.
SD/MMC I/F in SOM-A255x only support 1-bit memory mode, not support
I/O mode.
2.2.8 Audio (AC’97 Codec on board)
All SOM-A255x uses Realtek ALC202 AC97 audio Codec on SOM
module. SOM-A255x series provides mono microphone-in, stereo line-in, and