You can try the loopback handshaking cable if the interface can work without needing handshake:
Ozan
toggle quoted message
Show quoted text
On Mon, Mar 13, 2023 at 03:00 PM, <andrianakisharis@...> wrote:
Hi all,
I want to connect my HP 8595E to my PC using the only available port it has, RS232 via a DB-25 connecter (option 023).
As i couldn't find out the correct pinout i managed to make a quick limited teardown, remove the RS232 board and confirm the pinout.
So the pinout I have figured out is as follows:
P1. GND ( It should be the shielding but it's shorted to GND)
P2. is MC1488 Output so it should be the TxD
P3. is SN75189 Input so it should be the RxD
P4. is MC1488 Output so if we follow the universal pinout it may be RTS
P5. is SN75189 Input so if we follow the universal pinout it may be CTS
P6. unconnected
P7. GND
P8. is SN75189 Input? so if we follow the universal pinout it may be DCD
P20. is MC1488 Output so if we follow the universal pinout it may be DTR
?
So following the Programmer's Guide I made the following connections and i gave it a try
?
SA? ? ? ? ? ? ?PC (USB RS232 adapter)
P1. GND? ? ?Unconnected
P2. TxD? ? ? RxD
P3. RxD? ? ? TxD
P4. RTS? ? ? DCD
P5. CTS? ? ? DTR? ?(measured -6V coming from the adapter)
P6. unconnected
P7. GND? ? ?GND
P8. DCD? ? ?RTS
P20. DTR? ?CTS
?
PS. SA is operating RS232 at -11V to +11V while my adapter is operating at -6V to +6V but this shouldn't be the case.
?
But still I don't receive any replies.
?
SA Baud rate is 9600, my RealTerm config is Parity None, Data bits 8, Stop bit 1, No hardware flow control
Does anyone with this option figured out to establish communication with the SA?
