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07-20-2011 04:02 AM
07-20-2011 04:02 AM
We are communicating with a process control computer via the terminal driver using a TNA device. When the program executes a SYS$ASSIGN, to establish a channel, spurious characters are sent. Can I stop this behaviour, if so how?
I64 OpenVMS 8.3-1H1
TCPIP> show version
HP TCP/IP Services for OpenVMS Industry Standard 64 Version V5.6 - ECO 2 on an HP rx3600 (1.59GHz/9.0MB) running OpenVMS V8.3-1H1
Debug session of BASIC code
─ SRC: module LLBLINKASSIGN -scroll-source────────────────────────────────────────────────────────────────────────────────────────── 118: %PAGE
119: %SBTTL "Main"
120: Exit Function SysStatus If LLBELnkAssign(oLLBLink, SysStatus)
121: SysStatus = SYS$ASSIGN(Trm$(PropGetLLBLink(oLLBLink, "Device")) &
122: ,Chan, !acmode!, !mbxnam!)
-> 123: If SysStatus And 1% Then
124: Call PropLetLLBLink(oLLBLink, "Channel", WordStr(Chan))
125: GoSub LATConnect If PropGetLLBLink(oLLBLink, "Protocol") = "L"
126: Else
127: Subs(1) = Trm$(PropGetLLBLink(oLLBLink, "Device"))
128: Subs(2) = Num1$(SysStatus)─ OUT -output───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────stepped in THREAD 1
LLBLINKASSIGN\LLBLINKASSIGN\SYSSTATUS: 1
LLBLINKASSIGN\LLBLINKASSIGN\CHAN: 816
TCPTrace of packet with spurious characters created as a result of the $ASSIGN
TCPtrace XMT packet 101 at 18-JUL-2011 15:30:51.44
IP Address Port Seq # Ack #
Source 10.123.1.202 62045 481560460 2172722896
Destination 10.123.1.71 2102
Packet Length 46
TCP flags PSH ACK
window 62780
Hex Count Ascii
-------- -------- -------- -------- ---- ----------------
CA017B0A E1B80680 0000E269 2E000045 0000 E...i........{..
D01E8181 8C07B41C 36085DF2 | 47017B0A 0010 .{.G.].6........
03FB FF01FBFF | 00005EE6 3CF51850 0020 P..<.^........
Device is set up as TNA102
show term tna102 /full
Terminal: _TNA102: Device_Type: Unknown Owner: No Owner
Input: 9600 LFfill: 0 Width: 80 Parity: None
Output: 9600 CRfill: 0 Page: 24
Terminal Characteristics:
Interactive No Echo Type_ahead No Escape
Hostsync No TTsync Lowercase No Tab
Wrap Scope No Remote Eightbit
No Broadcast No Readsync No Form Fulldup
No Modem No Local_echo No Autobaud Hangup
No Brdcstmbx No DMA No Altypeahd Set_speed
No Commsync Line Editing Overstrike editing No Fallback
No Dialup No Secure server No Disconnect Pasthru
No Syspassword No SIXEL Graphics No Soft Characters No Printer Port
Numeric Keypad No ANSI_CRT No Regis No Block_mode
No Advanced_video No Edit_mode No DEC_CRT No DEC_CRT2
No DEC_CRT3 No DEC_CRT4 No DEC_CRT5 No Ansi_Color
VMS Style Input <CTRL-H> Backspace
Solved! Go to Solution.
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07-20-2011 04:43 AM
07-20-2011 04:43 AM
Re: SYS$ASSIGN sends characters to terminal
There is no mechanism to disable this, because this should not happen; sys$assign should not generate any I/O to the output. This looks like a bug (probably) in the IP stack. Patch TCP/IP Services to current and also patch OpenVMS to current, then (if that doesn't clear this) ring up HP support for a look. Or if you're in the typical environment with administrative restrictions around this sort of stuff, ring up HP support first, get (officially) told to patch to current, then (if that doesn't clear this) wait for HP to provide a fix.
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07-20-2011 04:56 AM
07-20-2011 04:56 AM
Re: SYS$ASSIGN sends characters to terminal
Thanks Hoff, I must admit I was expecting this response. It took me quite awhile to convince myself that it was sys$assign causing the output. I still don't believe it but have run out of ideas.I did wonder, since the extra characters ends in ETX whether this was some sort of valid control sequence.
We can't go to 8.4 easily but I can get the system updated to the latest VMS and TCPIP patches.
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07-20-2011 05:00 AM
07-20-2011 05:00 AM
Re: SYS$ASSIGN sends characters to terminal
Kerry,
how are you creating the TNA device ?
Have you written/used this program on any other version of OpenVMS before or is the a new development ? With other words: did it ever work before ?
Volker.
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07-20-2011 05:28 AM
07-20-2011 05:28 AM
Re: SYS$ASSIGN sends characters to terminal
Hi Volker,
That was on my list of things to include, pity I didn't.
$ TELNET/CREATE 10.123.1.71 2102 102/PERM/PROTOCOL=TELNET
$ SET TERM/PERM/TYPEAHEAD/PASTHRU/NOTTSYNC/EIGHTBIT/NOBROAD/NOECHO TNA102:
$ SET SECURITY/CLASS=DEVICE/PROT=(S:RWLP,O:RWLP,G:RWLP,W:RWPL) TNA102:
We've been using this software for 20+ years but have just started to notice the problem when replacing DecServers with IOLAN port servers. We have no proof but think that the DecServers might have filtered this out. It's not causing any harm just causing a delay in the handshaking between the 2 systems, that resync on the second attempt.
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07-20-2011 05:37 AM
07-20-2011 05:37 AM
SolutionKerry,
did you try creating the TNA device with /PROTOCOL=NONE ? Just as a test...
If I understand you correctly, your process control computer now sees 'additional unexpected characters' on it's serial line, after switching from using DECservers to IOLAN port servers.
Sending this call to HP may not yield an immediate solution, as in communication problems, where 2 sides are involved, you may be up to lengthy discussions...
Volker.
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07-20-2011 05:58 AM
07-20-2011 05:58 AM
Re: SYS$ASSIGN sends characters to terminal
Thanks Volker,
That stops the extra characters. I have a felling of deja vu now.
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07-24-2011 01:21 AM
07-24-2011 01:21 AM
Re: SYS$ASSIGN sends characters to terminal
Although the code is written in C language, would it be of any help for you ? Refer to TN.C and TN.H at http://vouters.dyndns.org/tima/OpenVMS-GNV-Alternate_DCL_image_using_a_Telnet_device.html with its usage inside DCL.C
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07-24-2011 01:33 AM
07-24-2011 01:33 AM
Re: SYS$ASSIGN sends characters to terminal
Your /PROTOCOL=TELNET initiates a telnet subnegociation with the remote peer. This is why the /PROTOCOL=NONE is better advised if the remote peer does not handle this subnegociation. A excellent to view the sent/received characters is to run the tcpdump utility.. I do advise using tcpdump any time a TCP/IP communication between two peers does not give expected results. For an example of tcpdump usage under OpenVMS can be viewed at http://vouters.dyndns.org/tima/All-OS-Samba-Windows-Sharing-IP_ports_usage_with_Windows_sharing.html In the tcpdump command, you shall to adjust udp ports tracing to tcp ports tracing.
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07-25-2011 12:57 AM
07-25-2011 12:57 AM
Re: SYS$ASSIGN sends characters to terminal
Thanks to all. We have now modified the port creation to protocol=none and synchronisation occurs on the first attempt without delay. The messaging protocol between the 2 systems contains it's own error detection so there should be no problems using raw mode.