RS-232 Control

Serial Port: The 9-pin Sub-D (male) connector on the MG2500 rear panel provides the RS-232 compatible serial interface signals used for computer control. The MG2500 Serial Port transmits serial data on pin 3 (TxD), receives serial data on pin 2 (RxD), and provides a ground on Pin 5. The Data Terminal Ready (DTR) & Request To Send (RTS) output signals are connected to the +12 Volt power supply (through a resistor) and are always asserted when the MG2500 power is on. NOTE: The Serial Port may also transmit commands which are received via the Logic Inputs, depending upon the echo character assignments (see Setup on pg. 10).

1 2 3 4 5

6 7 8 9

pin #1 =		not used	pin #6 =		not used
pin #2 =		Receive Data (RxD) input	pin #7 =		Request To Send (RTS) output
pin #3 =		Transmit Data (TxD) output	pin #8	=	not used
pin #4	=	Data Terminal Ready (DTR) output	pin #9	=	not used
pin #5	=	ground

serial port

The MG2500 only requires receive data (pin 2), transmit data (pin 3), and signal ground (pin 5) to be connected for successful data communications (see cable diagram below). However, the PC may require that signals be present on the data set ready, clear to send, or carrier detect inputs, as well as the receive data, transmit data, and signal ground pins. Success or failure depends entirely on the actual computer hardware and software being used. When trying to solve an interfacing problem, the most important thing to remember is that an output of one device should connect to one or more inputs of the other device, and that two outputs should never be connected together. Also, keep in mind that the RS-232 specification calls for the cable length to be no greater than 50 feet (although it is not unusual to be able to operate over distances of 150 to 250 feet), and the connectors must be of the appropriate gender (male or female) to mate properly. For best results, a shielded cable should be used, with the shield connected to chassis ground. Since the MG2500 serial interface ground is also tied (indirectly) to the analog signal ground, undesirable ground loops may occur when the MG2500 is connected to a PC (if the system grounding is not carefully designed). For best performance, the PC ground and the chassis ground of the MG2500 should be at the same potential, and the PC should get AC power from the same source as the MG2500 (and any other audio equipment which is connected to the MG2500). Since most lap-top computers are isolated from earth ground, this should rarely pose a problem.

Serial Port Data Communications Parameters: The MG2500 communicates through the Serial Port at the factory selected rate of 38400 bits per second, with 8 data bits, 1 stop bit, and no parity. The MG2500 utilizes a subset of the standard 7-bit ASCII character set. The eighth data bit of each character (the most significant bit) should always be 0. The computer should not echo the characters it receives. The computer should not be set for either hardware (DTR) or software (XON/XOFF) flow control. The baud rate may be changed to either 2400, 9600, or 19200 bits per second by means of the software (see Setup on pg. 3). NOTE: Baud rate may need to be changed when the MG2500 is being used in RS-232 systems with other products having a lower maximum baud rate.

Link Port Connections: The 9-pin Sub-D (female) connector on the MG2500 rear panel provides the RS-232 compatible serial interface signals used for linking multiple products within a system. The Link Port of one device simply connects to the Serial Port of the next device, and so forth (see diagram below). NOTE: All but the final device in a system should have its ‘Link’ switch pressed in (see Front & Rear Panel Features on pg. 2). The Link Port may also transmit commands which are received via the Logic Inputs, depending upon the echo character assignments (see Setup on pg. 10).

5 4 3 2 1

9 8 7 6

pin #1 =		not used	pin #6 = not used
pin #2 =		Transmit Data (TxD) output	pin #7 =		not used
pin #3 =		Receive Data (RxD) input	pin #8	= not used
pin #4	=	not used	pin #9	=	not used
pin #5	=	ground

link port

PC	serial port		Serial Cable	serial port		MG2500	MG2500	link port		Link Cable	serial port		unit 2
CD	1	1		1	1	n/a	n/a	1	1		1	1	n/a
RxD	2	2		2	2	RxD	TxD	2	2		2	2	RxD
TxD	3	3		3	3	TxD	RxD	3	3		3	3	TxD
DTR	4	4		4	4	DTR	n/a	4	4		4	4	DTR
gnd	5	5	(shield)	5	5	gnd	gnd	5	5	(shield)	5	5	gnd
DSR	6	6	(shield)	6	6	n/a	n/a	6	6	(shield)	6	6	n/a
RTS	7	7		7	7	RTS	n/a	7	7		7	7	RTS
CTS	8	8		8	8	n/a	n/a	8	8		8	8	n/a
RI	9	9		9	9	n/a	n/a	9	9		9	9	n/a
	male	female		female	male			female	male		female	male
							13

MG2500 specifications

The Atlas Sound MG2500 is a robust and versatile professional audio mixer designed to meet the demands of various applications, including live sound, broadcasting, and recording environments. This mixer stands out for its exceptional build quality, intuitive layout, and advanced features, making it a favorite among audio professionals.

One of the main features of the MG2500 is its configuration, which typically includes 16 channels, allowing for extensive input options. Each channel is equipped with high-quality preamps that ensure clean and clear signal transfer. The mixer offers both XLR and quarter-inch inputs, accommodating a variety of microphones and instruments. Additionally, the MG2500 provides phantom power, enabling the use of condenser microphones that require an external power source.

The MG2500 incorporates a 3-band equalization on each channel, consisting of low, mid, and high-frequency controls. This feature allows users to enhance or reduce specific frequency ranges, tailoring the sound to fit the environment and accommodating various audio sources. The inclusion of multiple auxiliary sends enables stage monitoring and effects processing, enhancing flexibility in live settings.

One of the standout technologies in the MG2500 is its onboard digital effects processor. This feature offers a wide range of customizable effects, such as reverb and echo, which can be applied to any channel, enriching the overall sound experience. The user-friendly interface makes accessing these effects straightforward, allowing for quick adjustments during performances.

The mixer also caters to modern audio needs with USB connectivity, facilitating easy integration into digital audio workstations (DAWs). This function makes recording and playback seamless, appealing to both live sound engineers and studio producers. Furthermore, the MG2500 is designed to withstand the rigors of live performances, featuring a durable chassis that ensures longevity and reliability under demanding conditions.

In terms of output options, the MG2500 includes multiple main and monitor outputs, allowing for flexible routing and connection to various sound systems. Additionally, the built-in audio limiter helps prevent signal clipping, ensuring clear and undistorted sound at high volume levels.

With its powerful features and robust construction, the Atlas Sound MG2500 is an excellent choice for professionals seeking a reliable and flexible audio mixer capable of delivering superior sound quality across various applications.

RS-232 CONTROL

pin #3 =

serial port

link port

MG2500 specifications