Overview Overview The Mark Levinson No320S preamplifier is equipped with an RS-232 control port. A complete set of command inputs and status outputs allow control of the No320S by an external control system (such as AMX or Crestron). This guide contains connection details and the RS-232 command list. Contacting Phone Technical Support 860-346-0896 9am to 5pm EST Monday thru Friday Fax 860-347-6251 Please allow 24hrs for reply Email madts@harman.com Please allow 24hrs for reply 2
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Connection RS-232 Port RS-232 control is through an RJ-11 connector located on the back of the No320S next Location to the IR output. This connector has 6 pins of which only three are used for communication. RX TX GND RS-232 Port Pin Configuration. The No320S will receive control data on pin 2 Data Receive and transmit status data on pin 3 Data Transmit. The connection Cable between the No320S and the control device will need to be configured so that the No320S’s receive is connected to the
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RS-232 Control Madrigal Audio Labs offers several parts to help communicate via RS-232 to the Cable 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 # M
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Diagram 2 – RJ-11 to DSUB9 Cable Parts Used for Cable Digikey Part# Radioshack Part # (1) A2047-ND 276-1537 - 9 pin DSUB Female Connector (2) A9027-ND 279-421 - 6 pin RJ-11 Connector (3) A9001-ND 276-1539 - 9 pin DSUB Housing (4) - 6 Conductor Data / Phone Cable H0063 (length in feet)-ND 910-2319 (3) - 9 pin DSUB Housing A sse m b le per manufac turers spec ific ations (1) - 9 pin DSUB Female Inside View (2) - 6 Pin RJ-11 Connector (4) - 6 Conductor Data / Phone Cable NOTE Orientation of Cut
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Command list Settings: 38.4K baud, 1 stop bit, no parity Format: ! or !Vxx.x The '!' is used as a framing character and can be sent any time to reset the packet reception code. Note that all commands are 5 bytes ( '!' + 3char command + ) with the exception of the direct volume command which is 7 bytes ( '!' + 'V' + 4 bytes data + ) = 0x0d, carrage return. Example: !GI1 ( selects input 1 on No320S) Keys: COMMAND DESCRI
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GI2 Go to input 2 GI3 Go to input 3 GI4 Go to input 4 GI5 Go to input 5 GI6 Go to input 6 GI7 Go to input 7 Note: “GI7” selects either input 7 or phono input if installed. GBA Go to balance mode GBE Exit balance mode IOF Go to display intensity 0 I25 Go to display intensity 25% I50 Go to display intensity 50% IFU Go to display intensity 100% Status: COMMAND DESCRIPTION MON Enable RS232 status updates (default) MOF Disable RS232 status updates No
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Status Update: Any change in the following 6 control keys will automatically send out the corresponding ASCII string. CONTROL KEY RETURNED VALUE COMMENT Select knob 1:IN:<1-7>: or input alias = first 7 ascii 1:IN:NONE if no current valid input characters from No320S selection input alias> is max 7 chars, no LED display. null termination Volume knob 2:VOL:xx.x or 2:VOL:OFF xx.x = last 4 ascii characters from No320S display Mute 3:MUT
