Re: RACAL MKIII MODEM Nest

pbartlett wrote:
On 31 Mar, 02:54, Reed <r...@xxxxxxx> wrote:
SNIP







We can power up the card using the rig and talk to the DTE (using
hayes commands) port fine if the modem is in dial mode. But if the
card has been previously in leased line mode then we can't talk to it
over the DTE port. If we plug in a VT terminal to the control port
and type
Connect 1,1
All that happens is that i echos back and no further dialogue. Our
engineers need to "talk" to the control port to be able to default the
card... any ideas?
Rgds
Phil
Have you been able to use the "control" port with a "dial" modem, using
the VT "connect 1,1" etc ?? IOW, has control port (vs DTE port) access
via your "rig" ever worked ??

If it does, then I have no clue why LL mode fails.
If it does not work for dial either, then I suspect the "rig's" control
port is missing something.

--reed- Hide quoted text -

- Show quoted text -

We are just connecting a VT directly to the control port on the card.
Does the ALM1623 only have one control port on it, though which you
can connect to any modem? or does the chassis have 1 control port for
every modem installed?


From the 3239CS manual,
"connect the VT terminal's serial port to the control port of any 3239CS installed in the card cage. This single connection allows the terminal to control any 3239CS in up to 16 daisy-chained card cages. Set terminal for 9600 8N1."

The cage's 3239CS backplane support 8 cards. 2 per cage

Sorry I do not have a ALM1623 Cage manual. It would appear there may be some circuitry on the backplanes that directs control port communication to a slot as necessary, or tells each card, by slot, what address to respond to. It was somewhat common in Racal product cage/nests to have backplanes that were more than just "wires".

Do you have any cages and BPs now to look at ??

--reed

.

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