C-2 Model 3321 Aerodynamic Particle Sizer
Spectrometer
Table C-1
Signal Connections for RS-232 Configurations
Pin Number RS-232 Signal
1 —
2 Transmit Output
3 Receive Input
4 —
5 GND
6 —
7 —
8 —
9 —
Baud R a t e
The baud-rate setting is the rate of communication in terms of bits per
second (baud). The Model 3321 uses a baud rate setting of 9600, 19,200
or 38,400. For proper communications, make sure that all software used
with the instrument is set at the appropriate rate. The baud-rate must be
set to 38,400 for correlated mode. See SMT and SB commands.
Parity ( 7 - B its Even)
Parity is the additional bit that accompanies the seven data bits to confirm
that they are transmitted correctly. It is set so that the number of “1” data
bits (high) in a transmitted character is always an even number. The Model
3321 APS™ spectrometer uses even parity as the only setting.
Stop B i t s and Flo w Contr o l
The APS™ spectrometer uses a Stop bits setting of 1 and a Flow Control
Setting of None.
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