Comtrol Building Custom Cables - Manual (Page 2)

2 Building Custom Cables
Building Custom Cables
Shielding Cables
The controller falls within the limits for a Class A computing device
established by the FCC. To comply with these limits, the serial cables
used to connect the controller to external devices should be shielded.
The shield should be connected to a metal or metallized connector
shroud on each end of the cable.
Using Modular Connectors
The RJ45 and RJ11 connector is similar to the phone-jack type of
connector. Both the connector and cable are easily available from your
distributor or any electronics store. You may want to connect your
peripherals using a D-shell type of connector to an RJ45 interface with
a straight-through cable and an adapter that you build.
DTE to DCE Straight-Through Cables
The following figure shows the most common types of DTE to DCE
cables. This configuration also referred to as a modem cable, because
it works with most modems.
Note: If you have a DTE to DCE interface but are uncertain as to what
signals are needed, you can use a full 25-wire cable. This cable
is constructed like the following cable example, but in addition,
all of the remaining pins are connected
DTE to DTE Null-Modem Cables
If you need RTS-CTS/DTR-DSR hardware flow control, you can
probably use the following figure. Some equipment may require
different connections for the control signals.
RocketPort Connector
Signal
TxD
RxD
RTS
CTS
DSR
GND
DCD
DTR
Name
DB25
2
3
4
5
6
7
8
20
Signal
TxD
RxD
RTS
CTS
DSR
GND
DCD
DTR
Name Pins
DB9
3
2
7
8
6
5
1
4
Pins
DB25
2
3
4
5
6
7
8
20
Pins
Remote Connector
RJ45
4
5
1
8
7
3
6
2
Pins
RJ11 DB9
3 3
4 2
N/A 7
N/A 8
N/A 6
2 5
5 1
1 4
Pins Pins