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RS-232 Control
Cable
Madrigal Audio Labs offers several parts to help communicate via RS-232 to the
No320S. The following parts can be order from Madrigal Audio Labs Technical
Support.
Part # Description
MRC878 DSUB9 to RJ-11 Adaptor and 2 meter RJ-11 to RJ-11 Cable
MRC808 DUB9 to RJ-11 Adaptor
MLC732 2 meter RJ-11 to RJ-11 Cable
For general purpose and short cable runs to the No320S, Part # MRC878 contains
everything needed.
For cable lengths of more then 2 meters - Part # MRC808 and the length of cable
needed should be ordered.
RS-232 control units with port types other then DSUB9 will need to have the cable
constructed. To construct a cable please follow the example below.
Control Cable
Example
As an example on making the cable we will use the most common connector used,
which is a DSUB9. The No320S only needs 3 pins to control the unit via RS-232. As
mentioned earlier the No320S’s pin 2 Data Receive must connect to the control
devices Transmit. Please read the notes below before constructing the RS-232
cable.
q Verify Control Devices RS-232 Port Type and Configuration – Refer to Control
Device Owners Manual
q Determine length of cable needed – Check the control device owners manual for
length limitations
q Have all available parts
Before
Constructing the
Communications
Cable
o Length of Cable needed
o RJ-11 Connector
o Connector type used by RS-232 device
Cable Layout
The following diagram shows how to construct a basic DSUB9 to RJ-11 Cable.
Cable Connections
No320S RS-11
Pins
Controller DSUB9
Pins
1 – NOT USED
NO CONNECTION
2 – Data Receive
-----Connect to-----
3 – Data Transmit
3 – Data Transmit
-----Connect to-----
2 – Data Receive
4 – NOT USED
NO CONNECTION
5 – Digital Ground
-----Connect to-----
5 – Digital Ground
6 – NOT USED
NO CONNECTION