Ak Protocol Format; 13.1. Serial Interface And Ak-Commands; Interface Parameters - CAI 650 Series User Manual

Section 13
13.

AK Protocol Format

The master computer and the Model 650 analyzer communicates via the RS232 serial link. The
Model 650 analyzer acts as a "slave" and only responds to commands.
Serial Interface Parameters:
1) Baud from 300 to 9600 bps, can be selected via the display.
2) 7 or 8 data bits, 1 or 2 stop bits, and the parity (yes/no).
3) The data transmission is full duplex (no echo) with XON/XOFF protocol.
4) The "don't-care" byte" (byte 2) is adjustable (factory setting 20H).
Command Format:
<STX>
don't care
function code
space 20H
channel N° always "K0" for the analyzer
space
data
<ETX>
Answer Format:
<STX>
don't care
function code
space
status
space
data
<ETX>

13.1. Serial Interface and AK-Commands

The serial interface enables remote control of the Model 650 analyzer by
It is implemented as an RS232 V24 interface and meets all requirements of the AK protocol.
A 9-pin male connector at the back of the unit is used to connect a master computer with the
following pin assignment:
Pin 3 = Txd (transmit)
Pin 2 = Rxd (receive)
Pin 5 = Gnd (ground)
13.2.

Interface Parameters

Baud rate:
Data bits:
Stop bit:
Don't care:
Parity:
XON/XOFF:
California Analytical Model 650 Noxygen
650 NOXO2_v9.0.doc
02H Example: ASTZ K0
any byte (default 20H)
code 4 byte long (e.g., ASTZ)
20H
20H (onIy if followed by data, otherwise <ETX> )
data bytes (depending on the command)
03H
02H Example: STZ 0 SREM STBY
adjustable, factory setting 20H
same code as command package (e.g., ASTZ)
20H
0 without error or 1 to 9 when error (see also ASTF
command)
20H (onIy if followed by data, otherwise <ETX> )
parameter (depending on the command)
03H
9600, 4800, 2400, 1200, 600, 300 baud
7 or 8
1 or 2
1 byte, adjustable (e.g. 32)
Even, odd, none
Active or not active
Model 650 Noxygen Analyzer
a master computer.
Operators Manual
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