Antenna Analyzer AIM4170 page 43
Appendix 4 – RS232/USB Operation
Because some newer computers don’t have RS232 ports, it may be necessary to use an
RS232 to USB adapter with the AIM4170. The AIM’s RS232 port uses only three wires.
Pin 2 is the data from the AIM to the computer, pin 3 is the data from the computer to the
AIM and pin 5 is ground. Hardware handshaking is not used. The signal amplitude on
the I/O lines (pins 2 and 3) is approximately +/-5V.
If there seems to be a problem with the USB adapter, here are some tips for checking it.
When the AIM first powers up, it sends out a character string that can be received by any
terminal emulation program, such as HyperTerminal. To use HyperTerminal, which
is a standard accessory in Windows, click on the Start button in the lower left corner of
the Windows desktop. Then, click “Programs” -> “Accessories” -> “Communications” -
> “HyperTerminal”. Set HyperTerminal for the following parameters:
Baud rate=57600; 8 data bits; 1 stop bit; no parity; echo typed characters locally.
When HyperTerminal is ready, turn on the AIM4170 power. The green LED on the AIM
front panel will flash and the text displayed on the computer terminal is the following (or
similar):
Antenna Analyzer AIM4170
from Array Solutions
Oct 13, 2006
If this is displayed, it means the data from the AIM to the computer is okay.
To check data from the computer to the AIM, type K1 (K and a one). Note the K is
upper case. The command K1 will cause the AIM to turn on its Red LED. There is no
character space between the K followed by a 1, but the time interval between typing the
K and the 1 is not critical. Then, type K0 (K followed by a zero). The Red LED should
go off. This indicates the AIM is able to receive commands from the computer;
therefore, the I/O data link is working properly.
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