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miljnor:
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I have some further information that may help.
On all our HAAS machines from 1993 thru 2000 we get the same results as follows:
Pin 5 on the HAAS 25 pin RS232 connector is CTS and this is the hardware handshake input. I do not know if CTS affects XMODEM, but the CTS state ( -10v or +10 v, near zero is indeterminent ) has no effect on either DC or XON/XOFF modes. It does, as it should, control whether sending occurs or does not in RTS/CTS mode ( the hardware handshake mode ).
If CTS is -10 v relative to pin 7 (common), then sending is inhibited in RTS/CTS mode on all four of our machines. This results in a WAITING message on the HAAS CRT. No inhibiting occurs in DC or XON/XOFF modes from CTS. Exception is bug or hardware problem list below. This is adequate proof that CTS should not affect SENDING in software handshake mode.
If you disconnect any cable from the HAAS 25 pin com 1 connector and force CTS to the state described below, then the following results should occur.
1. Setup desired RS232 parameters --- baud rate, parity, stop bits, handshake mode (synchronization), and data bits. This is done under settings.
2. Select LIST PROG and put cursor on any program.
3. Push SEND RS232.
If handshake is RTS/CTS (hardware), then CRT should display WAITING as is expected if CTS is more negative than about -3 volts. The internal state ( logic 1 or 0 ) is indeterminent if CTS is open ( floating ). In other words HAAS does not appear to provide a pull down resistor on the CTS input.
If handshake is DC CODES (a form of software handshake), then program should transfer and end with SERIAL SND DONE.
XON/XOFF produces the same result as DC CODES. In neither case is any external signal required to initiate the send and state of CTS does not matter.
If in XMODEM mode, then system is simply hung with a display on CRT of SENDING. This is not good feedback, but one expects the system to hang.
Now for some confusing information. I have been able power up our 03 98 VF-3 and have it fail to send in XON/XOFF or DC and display a WAITING message with nothing connected to the HAAS RS232 connector. I do not know if I can repeat this occurance. Implies a power on reset initialization problem in HAAS. There is more to discuss in this area but I need more time on a related problem at a customer site with a similar effect but maybe not the same problem. At the customer site it appears to be a thermal problem.
When I was at the said customer site I call HAAS to determine whether CTS should have any effect in the software handshake modes. One tech had no idea. Another one told me that a negative signal on CTS would inhibit SEND in the software handshake modes. Clearly he does not know the logic of his RS232 circuit and software based on my above experiment on 4 machines spanning 7 years where CTS had no effect in software handshake mode.
But also there is or are hardware and/or software problems in two different machines at two different locations but of about the same year of build.
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