Roland V-Mixer M-400 User manual

RS-232C Reference
LIVE MIXING CONSOLE
M-400
M-400 RS-232C Reference Version 1.0
Copyright © 2007 ROLAND CORPORATION
All rights reserved. No part of this publication may be reproduced in any form
without the written permission of ROLAND CORPORATION.

2

3
Introduction .............................................................................................4
Setup ........................................................................................................5
About the RS-232C interface..................................................................................................................... 5
Connector and cable ....................................................................................................................... 5
Handshaking............................................................................................................................................... 5
Setup procedure.......................................................................................................................................... 6
Connection with the control computer ................................................................................................... 6
Settings on the control computer ............................................................................................................. 7
Settings on the M-400................................................................................................................................. 7
Overview of commands..........................................................................8
Overview of commands ............................................................................................................................ 8
Protocol............................................................................................................................................. 8
Command syntax ............................................................................................................................ 9
Input parameters............................................................................................................................. 9
Output parameters.......................................................................................................................... 9
Cautions during use................................................................................................................................... 9
Command details ..................................................................................10
Channel selection parameters................................................................................................................. 10
Commands sent from the control computer to the M-400 ................................................................. 10
Details of commands sent from the control computer to the M-400 ................................................ 11
Control commands........................................................................................................................ 11
PTC: Phantom power supply on/off ............................................................................................. 11
PSC: j (phase) on/off ........................................................................................................................ 11
PGC: Preamp gain setting................................................................................................................ 12
FLC: Filter on/off.............................................................................................................................. 12
EQC: EQ on/off................................................................................................................................. 13
GTC: Gate on/off .............................................................................................................................. 13
CPC: Comp/limiter on/off ............................................................................................................. 14
AXC: AUX send setting.................................................................................................................... 14
PNC: PAN setting ............................................................................................................................. 15
MUC: Mute on/off............................................................................................................................ 15
FDC: Fader level................................................................................................................................ 15
SCC: Scene recall ............................................................................................................................... 16
RSC: Relative scene recall ................................................................................................................ 16
Request commands ....................................................................................................................... 17
CNQ: Channel name request .......................................................................................................... 17
PTQ: Phantom power supply request............................................................................................ 17
PSQ: j (phase) request....................................................................................................................... 18
PGQ: Preamp gain request .............................................................................................................. 18
FLQ: Filter request ............................................................................................................................ 19
EQQ: EQ request ............................................................................................................................... 19
GTQ: Gate request ............................................................................................................................ 20
CPQ: Comp/limiter request............................................................................................................ 20
AXQ: AUX send request .................................................................................................................. 21
PNQ: PAN request............................................................................................................................ 22
MUQ: Mute request.......................................................................................................................... 22
FDQ: Fader request........................................................................................................................... 23
SCQ: Current scene request............................................................................................................. 23
VRQ: Version request....................................................................................................................... 24
Details of the reply commands............................................................................................................... 25
Commands transmitted from the control computer to the M-400......................................... 25
ack: Active reply................................................................................................................................ 25
ERR: Error .......................................................................................................................................... 25
Xon (11H) / Xoff (13H): Handshaking commands...................................................................... 25
Commands transmitted from the M-400 to the control computer......................................... 26
ack: Active reply................................................................................................................................ 26
ERR: Error .......................................................................................................................................... 26
Xon (11H) / Xoff (13H): Handshaking commands...................................................................... 26

4
Introduction
This manual explains how you can control the M-400 via RS-232C. For details on the M-400 itself, please refer
to the M-400 owner’s manual. This document assumes that you have a general understanding of computers.
For details on computer terminology and usage, please refer to other documentation.
Please be aware that the contents described in this document are subject to change without notice.

5
Setup
RS-232C is a standard serial interface. An explanation of the connections used by the M-400 is given below.
When data is sent from the computer and the M-400’s processing speed is slower than the speed of the
incoming data, something must be done to prevent part of the data from being lost. Conversely, when data is
transmitted from the M-400 and the computer’s processing speed is slower than the arriving data, loss of data
can occur in the same way.
For this reason, the M-400 uses “Xon/Xoff” handshaking. The external computer can control the transmission
from the M-400 in the same way.
“Xon”: This signal is named DC1 (11H) in ASCII code; it is a control code requesting that transmission be started.
“Xoff”: This signal is named DC3 (13H) in ASCII code; it is a control code requesting that transmission be stopped.
About the RS-232C interface
Connector and cable
Handshaking
7968
123 54
Connector specifications
Pin number Signal name
1
2
3
4
5
6
7
8
9
NC
RxD (Data In)
TxD (Data Out)
NC
GND
NC
Connected to pin 8
Connected to pin 7
NC
*1 Connected internally within the M-400 (pins 7 and 8).
*2 In order for the M-400 to operate, the three pins RXD, TXD,
and GND must be connected as shown in the diagram.
Cable specifications
RS-232C CABLE *2
M-400 COMPUTER
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
FG
RxD
TxD
GND
*1

6
Setup
To set up the M-400 and the computer that will control it, proceed as follows.
1
Connect the control computer.
Use a RS-232C cable to connect your computer and the M-400.
Refer to "Connection with the control computer" (p. 6).
2
Power up the computer that will be controlling the M-400.
3
Make settings for the control computer
Perform the communication settings.
Refer to "Settings on the control computer" (p. 7).
4
Make settings on the M-400.
Perform the communication settings.
Refer to "Settings on the M-400" (p. 7).
5
Start operating the M-400.
Control computer —-> M-400 data transmission will begin.
1
Power off the M-400 and the computer.
2
On the rear panel of the M-400, set the RS-232C/MIDI switch to the RS-232C
position.
3
Use an RS-232C cable to connect the RS-232C connector of your computer to
the RS-232C connector located on the back of the M-400.
For details on the cable to use, refer to "Connector and cable" (p. 5).
Setup procedure
Connection with the control computer

7
Setup
1
Communication settings on the computer
* For details on how to set the communication settings, refer to the owner’s manual of the computer you’re using.
When you power up the M-400, the communication speed will be set to 115200 bps by default.
If you’re using the M-400 via RS-232C, you’ll need to set its communication speed to match the setting of the
computer.
For details on how to set this, refer to the M-400 owner’s manual.
Settings on the control computer
Communication method Synchronous (asynchronous), full-duplex
Communication speed 4800 / 9600 / 14400 / 31250 / 38400 / 57600 / 115200 bps
You can select this as desired, but it must be the same as the setting
on the M-400.
Parity none
Data length 8 bit
Stop bit 1 bit
Code set ASCII
XonXoff on
Settings on the M-400

8
Overview of commands
The M-400 and the control computer communicate via commands.
There are several types of commands, and you can control the M-400 by using the command that’s
appropriate for your purpose.
Single-byte alphanumeric characters are used for commands.
In general, the command syntax is an ASCII string consisting of “ stx ” and “three uppercase letters” followed
by a “ ; ” (semicolon).
The three letters indicate the type of command. However, there are other types depending on the command.
(Refer to "Command syntax" (p. 9))
*“ stx ”: This is the name of the signal in ASCII code (code number 02H in hexadecimal); it is a control code that indicates
the beginning of a command.
*“ ; ”: This code lets the M-400 detect the end of the command.
<Ex.> To transmit the ** command, transmit the ASCII string “ stx**; ”
Depending on the command, there are two types of communication protocols between the control computer
and the M-400.
1. When specifying an operation or setting for the M-400
This type corresponds to the "Control commands" (p. 11).
These commands use the procedure shown in the following diagram.
fig.PrtConcept1.eps
a. Transmit the command from the computer to the M-400.
b. The M-400 will output “ ack ” if the command was received correctly, or an ERR command in case of
invalid reception.
*" ack ": This is the ASCII code name of the control code ( 06H in hexadecimal) acknowledging successful reception.
* Invalid reception corresponds to cases in which the syntax of the received command was incorrect.
* stxERR is the command used to transmit or receive an error indication.
Overview of commands
Protocol
COMPUTER M-400
a. stx + command
b. ack or stxERR command

9
Overview of commands
2. To learn the settings of the M-400
This type corresponds to the "Request commands" (p. 17).
Commands used to check the status of a setting in the M-400 use the following procedure.
fig.PrtConcept2.eps
a. Transmit the command from the computer to the M-400.
b. If the M-400 receives the command correctly, it will send back a command containing the information
that was requested. If the command was not received correctly, an ERR command will be sent back.
c. If the output of the M-400 was received correctly, an “ ack ” will be sent back. (* This “ ack ” can be
omitted.)
* If the ERR command is sent to the M-400, the M-400 will re-transmit the command it sent in step “b.”
This command can also be omitted; instead of returning anything, you can repeat the procedure from step “a.”
Note: The M-400 will not transmit anything when a setting is changed by a controller operation on the M-400 itself.
There are several possible types of syntax for commands (control signals).
Type 0: Commands consisting only of a control code
“ ; ” is not added to these. They consist only of the control code.
<Ex.> ack
Type 1: Commands that have no parameters
These commands end with “ ; ”.
<Ex.> stxVRQ;
Type 2: Commands that have parameters
Command: parameter, parameter ... ;
The command is separated from the parameters by a “ : ” (colon).
Parameters are separated by a “ , ” (comma).
The end of the parameters is indicated by a “ ; ” (semicolon).
Note: No spaces or tabs are allowed between commands or parameters.
In general, parameters are given as decimal numbers or letters, and are of variable length.
<Ex.> stxFDC:I1,-25; / stxFDC:I12,0; / stxFDC:AX16,0; / stxFDC:MA,-10;
Parameters are generally given in decimal or alphabetic form, and their length may vary.
<Ex.> stxFDS:I5,-12; / stxFDS:I24,0; / stxFDS:AX8,-6; / stxFDS:MA,-12;
Do not perform the following actions while the control computer and the M-400 are communicating. Doing
so may cause the M-400 to malfunction.
• Disconnect the RS-232C cable
• Power off the M-400
Command syntax
Input parameters
Output parameters
Cautions during use
COMPUTER M-400
a. stx + command
b. stx + command or stxERR command
c. ack or stxERR command

10
Command details
Some commands have a parameter that select a channel, DCA group or user fader. These parameters are
called the “channel selection parameter.” The relationship between the M-400’s channels and channel
selection parameters are shown below.
1. Input channels
M-400 channels: CH1, CH2, ... CH48
Channel Selection Parameter: I1, I2, ... I48
2. Output channels
M-400 channels: AUX1, AUX2, ... AUX16, MAIN L, MAIN R
Channel SelectionParameter: AX1, AX2, ... AX16, MAL, MAR
3. DCA groups
M-400 groups: DCA1, DCA2, ... DCA8
Channel Selection Parameter: DCA1, DCA2, ... DCA8
4. USER FADER
M-400 faders: USER1, USER2, ... USER24
Channel SelectionParameter: U1, U2, ... U24
The following three types of commands are sent from an external device to the M-400.
1. Control (execution) commands
These commands are used to adjust the volume and to make various settings.
2. Request commands
These commands are used to check the current state of the M-400’s settings.
* After performing a control operation, you should use a request command to check the state of the settings.
3. Reply commands
Commands such as “ack” and “ERR” are in this category.
These commands are used to reply to the M-400 when a request command is used.
Channel selection parameters
Commands sent from the control computer to the M-400

11
Command details
PTC: Phantom power supply on/off
Function Turns the +48V phantom power supply on/off.
Syntax stxPTC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxPTC:I1,1;
Turns the CH1 phantom power on.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify a channel that does not have phantom power
• if you specify U1–U24 that is assigned to the above
PSC: ϕ (phase) on/off
Function Turns ϕ(phase) on/off.
Syntax stxPSC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxPSC:I1,1;
Turns the CH1 ϕ(phase) on (inverted phase).
Note: If you’re selecting a stereo-linked input channel, you can set this for either the L or R channel (not both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16, MAL, MAR or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
Details of commands sent from the control computer to the M-400
Control commands

12
Command details
PGC: Preamp gain setting
Function Sets the pad and preamp gain of a channel.
Syntax stxPGC:a,b,c; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
b: Pad on/off
0 (Off)
1 (On)
c: Preamp gain *1 dB steps
-10 to -65 (with pad off)
10 to -45 (with pad on)
0 to -18 (for STEREO IN channel)
<Ex.> stxPGC:I1,1,4;
Turns the CH1 pad on, and sets the preamp gain to +4 dB.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify a channel that has no gain adjustment
• If you turn on the pad of a channel that has no pad
• If you specify a GAIN of 10 to -9 for a channel whose pad is turned off
• If you specify a GAIN of -46 to -65 for a channel whose pad is turned on
• If you specify a GAIN setting outside the range of 0 to -18 for the STEREO IN channel
• If you specify U1–U24 that is assigned to the above
FLC: Filter on/off
Function Turns the filter on/off.
Syntax stxFLC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxFLC:I1,1;
Turns the CH1 filter on.
Note: If you’re selecting a stereo-linked input channel, you can set this for either the L or R channel (not both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16, MAL, MAR or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above

13
Command details
EQC: EQ on/off
Function Turns the four-band EQ on/off.
Syntax stxEQC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR or U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxEQC:I1,1;
Turns the CH1 four-band EQ on.
Note: If you’re selecting the MAIN channel, you’ll be able to set this only for L or R (not both), since the MAIN L/R
channels are stereo-linked.
Note: If you’re selecting a stereo-linked input channel or AUX channel, you can set this for either the L or R channel (not
both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify DCA1–DCA8
• If you specify a U1–U24 that is assigned to the above
GTC: Gate on/off
Function Turns the gate on/off.
Syntax stxGTC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxGTC:I1,1;
Turns the CH1 gate on.
Note: If you’re selecting a stereo-linked input channel, you can set this for either the L or R channel (not both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify I25–I48, AX1–AX16, MAL, MAR or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above

14
Command details
CPC: Comp/limiter on/off
Function Turns the compressor/limiter on/off.
Syntax stxCPC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I24, AX1–AX16, MAL, MAR or U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxCPC:I1,1;
Turns the CH1 compressor on.
Note: If you’re selecting the MAIN channel, you can set this for either L or R (not both), since the MAIN L/R channels are
stereo-linked.
Note: If you’re selecting a stereo-linked input channel or AUX channel, you can set this for either the L or R channel (not
both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify I25–I48 or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
AXC: AUX send setting
Function Sets the AUX send level and AUX pan from CH1–48 or MAIN.
Syntax stxAXC:a,b,c,d; (Command syntax: type 2)
a: Channel selection (I1–I48, MAL, MAR or U1–U24)
b: AUX channel selection (AX1–AX16)
c: AUX send level (INF, -80.0–10.0) *0.1 dB steps
d: AUX pan (L63–C–R63) *Steps of 1
<Ex.> stxAXC:I1,AX15,4.0,R30;
Sets the CH1 AUX15 send level to +4.0 dBu, and the AUX pan to R30.
Note: If you’re selecting an AUX channel, and specify an AUX channel that is not stereo-linked, the M-400 will ignore the
AUX pan parameter.
Note: If you’re selecting the MAIN channel, you can set the AUX send level for either L or R (not both), since the MAIN
L/R channels are stereo-linked. AUX pan can be set individually for L and R.
Note: If you’re selecting a stereo-linked input channel, the AUX send level can be set for either the L or R channel (not both).
AUX pan can be set individually for L and R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16 or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above

15
Command details
PNC: PAN setting
Function Sets the pan.
Syntax stxPNC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR or U1–U24)
b: Pan (L63–C–R63) *Steps of 1
<Ex.> stxPNC:I1,L45;
Sets the CH1 pan to L45.
Note: If you’re selecting the MAIN channel, this parameter will operate as Balance since the MAIN L/R channels are stereo-
linked; you’ll be able to set this for either L or R (not both).
Note: If you’re selecting a stereo-linked AUX channel, this will operate as balance, and can be set for either the L or R
channel (not both).
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16 that is not stereo-linked
• If you specify DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
MUC: Mute on/off
Function Switches mute on/off.
Syntax stxMUC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR, DCA1–DCA8 or U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxMUC:I1,1;
Turns mute on for CH1.
Note: If you’re selecting the MAIN channel, you’ll be able to set this for either L or R (not both), since the MAIN L/R
channels are stereo-linked.
Note: If you select a stereo-linked input channel or AUX channel, you’ll be able to set this for either L or R (not both).
FDC: Fader level
Function Sets the fader level.
Syntax stxFDC:a,b; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR, DCA1–DCA8 or U1–U24)
b: Fader level (INF, -80.0–10.0) *0.1 dB steps
<Ex.> stxFDC:I1,INF;
Sets the CH1 fader to -Inf.
Note: If you’re selecting the MAIN channel, you’ll be able to set this for either L or R (not both), since the MAIN L/R
channels are stereo-linked.
Note: If you select a stereo-linked input channel or AUX channel, you’ll be able to set this for either the L or R channel (not
both).

16
Command details
SCC: Scene recall
Function Recalls a scene memory.
Syntax stxSCC:a; (Command syntax: type 2)
a: Scene number (000–299)
<Ex.> stxSCC:010;
Recalls scene number 010.
Note: If you specify a blank scene, the M-400 will return an ERR command (stxERR:5;) and ignore your command.
RSC: Relative scene recall
Function Recalls a scene memory relatively; e.g., “the previous memory” or “two scenes ahead.”
Syntax stxRSC:a; (Command syntax: type 2)
a: Relative scene number (-299–299)
<Ex.> stxRSC:-3;
Recalls the scene memory three memories earlier than the current scene number.
Note: If the scene memory number specified by relative scene is one of the following scenes, the M-400 will return an ERR
command (stxERR:5;) and ignore your command.
• A blank scene.
• A scene number outside the range of 0–299.

17
Command details
CNQ: Channel name request
Function Requests the channel/group name.
Syntax stxCNQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR, DCA1–DCA8 or U1–U24)
<Ex.> stxCNQ:I1;
Requests the channel name of CH1.
Command returned by the M-400
Syntax stxCNS:a,“b”; (Command syntax: type 2)
a: Channel number (I1–I48, AX1–AX16, MAL, MAR, DCA1–DCA8 or U1–U24)
b: Channel name (fixed at six characters)
<Ex.> stxCNS:I1,”A.BASS”;
Output the channel name A.BASS for CH1.
Note: If the channel name is blank, the output will be six spaces.
PTQ: Phantom power supply request
Function Requests the on/off status of the +48V phantom power supply.
Syntax stxPTQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
<Ex.> stxPTQ:I1;
Requests the on/off status of the +48V phantom power supply for CH1.
Command returned by the M-400
Syntax stxPTS:a,b; (Command syntax: type 2)
a: Channel number (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxPTS:I1,0;
Reports that the CH1 phantom power is off.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify a channel that does not have phantom power
• If you specify U1–U24 that is assigned to the above
Request commands

18
Command details
PSQ: ϕ(phase) request
Function Requests the on/off status of ϕ(phase).
Syntax stxPSQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
<Ex.> stxPSQ:I1;
Requests the on/off status of ϕ(phase) for CH1.
Command returned by the M-400
Syntax stxPSS:a,b; (Command syntax: type 2)
a: Channel number (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxPSS:I1,0;
Reports that the CH1 ϕ (phase) is off.
Note: If you’ve selected a stereo-linked channel, the same value will be returned for L or R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16, MAL, MAR, DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
PGQ: Preamp gain request
Function Requests the pad and preamp gain settings of a channel.
Syntax stxPGQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
<Ex.> stxPGQ:I1;
Requests the pad and preamp gain settings for CH1.
Command returned by the M-400
Syntax stxPGS:a,b,c; (Command syntax: type 2)
a: Channel number (I1–I48, U1–U24)
b: Pad on/off
0 (Off)
1 (On)
c: Gain (10 to -65) *1 dB steps
<Ex.> stxPGS:I1,0,-55;
Reports that the CH1 pad is off and the gain setting is -55 dB.
Note: If you specify a channel that has no pad, parameter “b” will return a value of “0”.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify a channel that has no gain adjustment
• If you specify U1–U24 that is assigned to the above

19
Command details
FLQ: Filter request
Function Requests the filter on/off setting.
Syntax stxFLQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, U1–U24)
<Ex.> stxFLQ:I1;
Requests the CH1 filter on/off setting.
Command returned by the M-400
Syntax stxFLS : a , b ; (Command syntax: type 2)
a: Channel number (I1–I48, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxFLS:I1,0;
Reports that the CH1 filter is off.
Note: If you select a stereo-linked input channel, the same value will be returned for L or R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify AX1–AX16, MAL, MAR or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
EQQ: EQ request
Function Requests the on/off setting of the four-band EQ.
Syntax stxEQQ:a; (Command syntax: type 2)
a: Channel selection (I1–I48, AX1–AX16, MAL, MAR, U1–U24)
<Ex.> stxEQQ:I1;
Requests the on/off setting of the CH1 four-band EQ.
Command returned by the M-400
Syntax stxEQS:a,b; (Command syntax: type 2, U1–U24)
a: Channel number (I1–I48, AX1–AX16, MAL, MAR)
b: On/off
0 (Off)
1 (On)
<Ex.> stxEQS:I1,0;
Reports that the CH1 four-band EQ is off.
Note: If you’re specifying the MAIN channel, you can specify either the L or R channel, since the MAIN L/R channels are
stereo-linked.
Note: If you specify a stereo-linked input channel or AUX channel, the same value will be returned for L or R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify DCA1–DCA8
• If you specify U1–U24 that is assigned to the above

20
Command details
GTQ: Gate request
Function Requests the gate on/off setting.
Syntax stxGTQ:a; (Command syntax: type 2)
a: Channel selection (I1–I24, U1–U24)
<Ex.> stxGTQ:I1;
Requests the gate on/off setting of CH1.
Command returned by the M-400
Syntax stxGTS:a,b; (Command syntax: type 2)
a: Channel number (I1–I24, U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxGTS:I1,0;
Reports that the CH1 gate is off.
Note: If you specify a stereo-linked input channel, the same value will be returned for L or R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify I5–I48, AX1–AX16, MAL, MAR or DCA1–DCA8
• If you specify U1–U24 that is assigned to the above
CPQ: Comp/limiter request
Function Requests the compressor/limiter on/off setting.
Syntax stxCPQ:a; (Command syntax: type 2)
a: Channel selection (I1–I24, AX1–AX16, MAL, MAR or U1–U24)
<Ex.> stxCPQ:I1;
Requests the compressor on/off setting for CH1.
Command returned by the M-400
Syntax stxCPS : a , b ; (Command syntax: type 2)
a: Channel number (I1–I24, AX1–AX16, MAL, MAR or U1–U24)
b: On/off
0 (Off)
1 (On)
<Ex.> stxCPS:I1,0;
Reports that the CH1 compressor is off.
Note: If you specify the MAIN channel, the same value will be returned for L or R, since the MAIN L/R channels are stereo-
linked.
Note: If you specify a stereo-linked input channel or AUX channel, the same value will be returned for L or R.
Note: If you specify the following parameters, the M-400 will return an ERR command (stxERR:5;) and will ignore your
command.
• If you specify I25–I48
• If you specify U1–U24 that is assigned to the above