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COM-1PDH-LPE Datasheet(PDF) 3 Page - Contec Co., Ltd

Part No. COM-1PDH-LPE
Description  RS-422A/485 1ch Serial I/O Board with Isolation for PCI Express Low Profile
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Maker  CONTEC [Contec Co., Ltd]
Homepage  https://www.contec.com/
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COM-1PDH-LPE Datasheet(HTML) 3 Page - Contec Co., Ltd

   
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Ver.1.02
COM-1PDH-LPE
3
LED Indicator
If you install two or more boards on one personal computer, assign a
different ID value to each of the boards to distinguish them.
The board IDs can be set from 0 - Fh to identify up to sixteen boards. If
only one board is used, the original factory setting (Board ID = 0) should
be used.
LED
Operation
Meaning
RxD(Green)
Flashing
Whenreceiving RS-422A/485
OFF
When not receiving RS-422A/485
TxD(Green)
Flashing
When transmitting RS-422A/485
OFF
When not transmitting RS-422A/485
Setting of Terminator
The terminator setting switch controls whether or not a terminator is
inserted into each signal line. Set the terminators on or off in accordance
with the devices with which you are communicating. The terminators
on the board are 100Ω resistors.
Setting Procedure
If you wish to use a terminator of other than 100Ω, set the terminator
switch OFF and insert an external terminator. The diagrams below show
examples of terminator installation for half and full duplex setting.
Half-duplex
Full -duplex
The figure below shows the circuit associated with the data transfer
mode setting switch and terminator setting switch.
External Connection
Connect an external device directly from the connector on the board, use
the provided transmission line connection terminal for creating your own
cables.
Pin Assignment
Interface connector signal layout
SignalName
Meaning
TxD+
Transmissiondata (+)
TxD-
Transmissiondata (-)
RxD+
Receptiondata (+)
RxD-
Receptiondata (-)
SG
Signalground
Types of Cable and Example Connections
The figures below show examples of how to connect the cable for the
board.
The RS-422A/485 interface works based on a differential signal whereby
the signal is carried by the potential difference between two lines (+ and
-). Using twisted pair cable is recommended to improve resistance to
noise.
Example Connection Oneself loop to RTS and CTS in Full Duplex
Example Connection in Half Duplex
SW2
[Term OFF]
TERM
MODE
RxD
TxD
Not inserted
Next figure B or C
(Other than both
terminators of the line)
Setting
method
[A or D]
Terminator
(Bit 9)
Terminator
(Bit 9)
(A)
(D)
(C)
(B)
[B or C]
SW2
SW2
SW2
TERM
MODE
TERM
MODE
TERM
MODE
RxD
TxD
RxD
TxD
RxD
TxD
Inserted
Not inserted
Not inserted
RxD
TxD
Terminator (Bit 9)
Terminator (Bit 7)
Terminator (Bit 7)
Terminator (Bit 9)
TxD
RxD
SW2
SW2
TERM
MODE
TERM
MODE
RxD
TxD
RxD
TxD
Inserted
Not inserted
TxD+
TxD-
RxD+
RxD-
RTS
DCD
DTR
DSR
RI
CTS
SIN
SOUT
Terminator
1/2W 100Ω
2 1
Terminator
Data transfer mode
162850
or equivalent to it
TxD+
TxD-
RxD+
RxD-
SG
- Connector on the board
MC 1,5/ 5-GF-3,5 P26 THR
[PHOENIX CONTACT] or equivalent
- Transmission line connection terminal
MC 1,5/ 5-STF-3,5
[PHOENIX CONTACT] or equivalent
- Applicable wire
AWG28-16
External device
RxD-
TxD-
TxD+
RxD+
SG
RxD-
TxD-
TxD+
RxD+
SG
External device
TxD-
TxD+
SG
TxD-
TxD+
SG


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