Computer Interface and Commands 7-7
Table 7-1
Signal Connections for RS-232 Configurations
Pin Number RS-232 Signal
1 GND
2 Transmit Output
3 Receive Input
4 (Reserved)
5 GND
6 —
7 —
8 —
9 —
An external computer is connected to Serial 1 for basic instrument
communications and when Aerosol Instrument Manager
®
software is used.
Serial 2 is used for attaching another instrument. Read and write
commands are sent and received from Serial 2 by the computer connected
to Serial 1. Serial 1 and Serial 2 can have different baud rates and
communications protocols. Normally, only Serial 1 is used.
Comm a n d s
All commands and responses, unless specified as binary-encoded, are
sent or received as ASCII characters. All messages are terminated with a
<CR> (0x0D) character. All linefeeds (0x0A) characters are ignored and
none are transmitted. Commands are case insensitive. Backspace
character (0x08) will delete previous characters in buffer.
In this specification, values enclosed by “<>” indicate ASCII
characters/values sent/received. For example, <,> indicates the comma
was sent or received via the communications channel.
Integers are 32-bit values. Floating point are IEEE() 32-bit values.
Integer and floating point values are ‘C’ string compatible ASCII-
encoded. For example, an integer value of
<11011100101110101001100001110110> binary, would be sent as
<3703216246>.
When char, integer or hex-decimal data is sent with more than one digit,
leading zeros should always be left off. If the value of the data is zero,
then one zero must be sent. An exception is the value zero in real format,
it should be sent as 00000E0.
The firmware commands are divided into the following categories:
READ Commands
SET Commands
MISC (MISCELLANEOUS) Commands
HELP Commands
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