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Reverse engineering Tektronix TDS3GV module for TDS3000 series oscilloscopes?
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coromonadalix:
@Jacquesbbb

it is not for the same scope series
JacquesBBB:
I know well that TDS220 is not the same series as TDS3000  but  the functions of the interface are the same, so maybe part of  them can be retrieved from the TDS2CM  module. At least  the serial interface. I wonder if the GPIB from the TDS2CM  could be  used for  a TDS3000.
JacquesBBB:
I got the 100 pins connector.
soldered 5 wires

67 : GND
68  :TxD
69 : RxD
70  :RTS
71  :CTS
 
Connected a serial to USB dongle based on a RS232   FTDI chip  using 3.3V option

Use  a  serial terminal emulator on my mac ( Coolterm)

set  the communication on the TDS3032  ( with ENG dongle) version 3.39 with all options.
Baud rate : 9600
flagging  : none
EOL : CR/LF

set the comm on coolterm

Baudrate : 9600
Data bits : 8
parity : none
stop bits : 1
CTS  on

I  have made a test by printing through the serial port. I properly received a postcript file  on the terminal.

Nevertheless,  I have no answer when I   send : *IDN?

What am I missing ?

Thanks for all
sicco:
Two things to check:

1. Signals are TTL logic levels, not RS232. So high (3V3) when idle, low when active.
2. Pin numbering on the 100 pins connector: the counting for pcb edge connector is different from the counting used on the original Molex part.
sicco:
And note that this serial port only gets active after plugin module detection. Each tds3xx plugin has an 8 bit ID that is sensed during bootup. Typically using a 74xx245 IC, that pushes the ID on the databus when a CE line is driven low. See posts higher up.

If after a boot the scope does not say that it has a serial module plugged in, then it will ignore the Rx,Tx pins that you used.
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