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Types of Cable and Example Connections
The connector used for COM8-(PCI)H has a wide interpin space and is highly reliable. In the case of a PC with a narrow slot opening, a gap
might be created as wide as the thickness of the sheet metal of the PC when an external cable is connected, preventing the connector from being
fitted properly. If the thickness of the sheet metal is less than 1.5mm (typically about 1.0mm), simply tighten the adjusting screw located on the
side of the connector to install it properly. The connector should function without a problem.
E x a m pl e C o n n e c t i o n t o a Mo de m ( S t r a i g h t c a bl e )
TxD
RxD
RTS
CTS
DTR
DSR
SG
E x a m pl e C o n n e c t i o n t o a P C ( C r o s s c a bl e )
TxD
RxD
RTS
CTS
DTR
DSR
SG
Differences to the COM-2(PCI), COM-4(PCI), and COM-8(PC)
The COM-2(PCI)H, COM-4(PCI)H, and COM-8(PCI)H boards are an enhancement of the previous COM-2(PCI), COM-4(PCI), and COM-
8(PCI) board models and are upwardly compatible with the COM-xx(PCI) boards. Accordingly, the boards can generally be used in the same way
as the COM-xx(PCI) boards.
There are some differences in the specifications.
Please refer to the EXAR Corporation data sheet for details about the LSI used on the boards.
COM-2(PCI)H,4(PCI)H,8(PCI)H
TxD
(Transmit Data)
RxD
(Receive Data)
RTS
(Request to Send)
CTS
(Clear to Send)
DTR
(Data Terminal Ready)
DSR
(Data Set Ready)
SG
(Signal Ground)
External device
TxD
RxD
RTS
CTS
DTR
DSR
SG
External device
COM-2(PCI)H
COM-2(PCI)
Baud rate
230.4kbps
FIFO buffer for
transmission and
reception
Controller chip
16552 or equivalent
COM-4(PCI)H
COM-4(PCI)
Baud rate
230.4kbps
FIFO buffer for
transmission and
reception
Maximum of 8 boards can be
Boards in one system
install in a same system.
Controller chip
16552 or equivalent
COM-8(PCI)H
COM-8(PCI)
Baud rate
230.4kbps
FIFO buffer for
transmission and
reception
Controller chip
16554 or equivalent
E x a m pl e C o n n e c t i o n t o a D e v i c e
TxD
RxD
RTS
CTS
DTR
DSR
SG
COM-2(PCI)H
921.6kbps
16-byte
128-byte
162850 or equivalent
COM-4(PCI)H
921.6kbps
16-byte
128-byte
Maximum of 16 boards can
be install in a same system.
162850 or equivalent
COM-8(PCI)H
921.6kbps
64-byte
128-byte
162850 or equivalent
Ver.3.30
TxD
RxD
RTS
CTS
DTR
DSR
SG
External device
8
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