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156-Serial Control Specs for AMX Devices

Frequently Asked Questions

Written by Will Fraser

Updated at February 10th, 2026

Table of Contents

Brand: Models: Question:   Answer:

Brand:

  • AMX

Models:

  • General

Question:  

What is the serial control specs for my device?


Answer:

Serial control specs for AMX Devices

Device

(RS-232

ports), IP

Device, etc. 

Input Buffer

(bytes from 3rd party device) 

Output Buffer (bytes to 3rd party device)  Baud range 

Max length of

SEND_STRING

to device (longer strings will be truncated)

Max length of Data     Packets from device
Axcent 

Unknown

(est. 96 bytes ea) 

  300 - 38,400  64 64
Axcent 2 

Unknown

(est. 96 bytes ea) 

  300 - 38,400  64 64
Axcent 3  128  128  300 - 115,200  64 64
AXB-EM232  256  256  300 - 38,400  64 64
AXC-232  96  96  300 - 38,400  64 64
AXC-232++  1,000 buffer sizes in manual  1,000  300 – 115,200  64 64
AXB-232+  160  160  300 - 38,400  64 64
AXB-232++  1,000 buffer sizes in manual   1,000  300 – 115,200  64 64
AXB-PCCOM  12,000  12,000  300 - 38,400  64 64
NXC-COM2  2,048  2,048  150 – 230,400  900 196
NXI  2,048  2,048  150 – 230,400  900

196 @19200 baud and higher.

160 @ 9600

80 @ 4800

40 @ 2400

20 @ 1200

10 @ 600

5 @ 300

5 @ 150

See AMX-PI for more detail

NI series ports   256 256 150 – 115,200  64 64
AXB-MIDI  3,072  6,143  31,250 64 64
AXC-MIDI  100  100  31,250  64 64

NXC-ME,

ME260,

NXC-

ME260/64,

NI-Master

     

131 Debug

Ports,

15,999 virtual devices -

interpreter string expression limit 

256 TCP/IP devices,

2012 virtual devices

UDM-RX02N  256

 16

 

(See TN926

for more info)

 1200 – 115,200

 

(Back channel from RX to UDM hub is very slow, ~50bps.

 256

 

(max tested value)

16

 

(UDM hub buffers up to 16 bytes before

passing data to master)

DVX-RX02N

(connected to

DVX-2100)

256

16

 

(See TN926

for more info)

 1200 – 115,200

(Back channel from RX to UDM hub is very slow, ~50bps.

 230

2

 

(DVX does not buffer

data, sends bytes to

master as they are received) ​
 


 

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Table of Contents

Brand: Models: Question:   Answer:

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