ASCII Commands used by Pelco Products

Product Line

Pelco Video Management, Pelco Matrix


  • Pelco ASCII Protocol


  • Programming



ASCII protocol uses the ASCII character set to transmit and receive commands between an ASCII device (such as a personal computer or ASCII keyboard) and the Pelco product.

The ASCII protocol communicates in a standard asynchronous, byte-oriented protocol that includes: 1 start bit, 8 data bits, 1 parity bit (odd parity), and 1 stop bit. The default communication rate is 9600 baud.

 A lowercase “a” ends each command. The Pelco product's ASCII translator acknowledges accepted commands and rejected commands with the following responses:

  • AKa command accepted
  • NAa command rejected or the ASCII translator does not recognize the command

If the command requires a numeric value, enter the number first.  All Transmitted characters MUST be ASCii.

Number ranges are enclosed in brackets. Do not enter or type in the brackets. When you control a fixed speed pan and tilt, omit the speed information.

NOTE: In a CM6800-96 x 16 Matrix system the numbers for cameras, monitors, alarms, and relays can be doubled.

**Note**: If controlling PTZ cameras using Pelco Coaxitron signal; BE SURE the protocol is in extended format.