6 Mar
2005
6 Mar
'05
3:59 a.m.
On Mar 6 2005, 0:41, Tony Duell wrote:
> Tony wrote...
> > My idea was going to be to hang a terminal off the card (assuming
you
> > have an RS232 lead and can decode the word
foramt and baud rate
settings
> > [1] and then try writing to the transmit
data registers at 777566
or
> > 777656. See if you can transmit chracters to
the terminal.
> I have the appropriate cable from the card to mate & lock, I'll
cobble
That sounds like a current loop cable. Do you have a terminal with a
20mA
loop input?
That's my thought too, but Tony beat me to it.
The RS232 buffer (and the companion 1489 receiver)
were not fitted on
all
versions of the DL11. It's worth checking if your
card as them, if
not,
they can always be fitted (I think all PCBs have the
pads and tracks
for
them), but you may need to fit some extra passives
too. If you need
to do
this. I'll dig out my prints and tell you just
what to do.
If you do have the RS232 buffer, then you can connect the output of
that
section (which is routed to a pin on the BERG
connector) to the RS232
receive input of a terminal.
It's easy to add the parts; I've done it a couple of times. AFAIR, to
get the full version, it's three RS232 chips, half a dozen resistors,
and a capacitor. Maybe a diode.
In case it helps, here's the pinout of the Berg connector, and the
connections to make an RS232 cable and a 20mA loop cable. The
"interlock" may require some explanation... The seril out from the UART
is connected to both the RS232 and 20mA buffers, so when it transmits,
it does so on both. However, you don't want both to be connected to
the UART receiver at the same time, so you have to jumper *either* the
20mA receiver *or* the RS232 receiver to the UART, and this is what the
"interlock" does:
Numbers are DB25 pin numbers (for the BC05C) or Mate-N-Lok pin
numbers (for 7008360):
Berg pin Signal BC05C 7008360
A Ground 1 Prot.Ground (blue/wht) - ground
B Ground 7 Signal Ground (brwn/wht)
C 25 Force Busy (red/org)
D 13 Secondary CTS (org/red)
E TTL serial in - interlock in - interlock in
F EIA serial out 2 Transmit Data (wht/blue)
H 20mA interlock - interlock out
J EIA serial in 3 Receive Data (org/wht)
K +20mA serial in 7 + Rec.Data
(green)
L 24 External clk (brwn/red)
M EIA interlock - interlock out
N 15 serial clk xmit (grey/grn)
P 19 Secondary RTS (lbue/blk)
R 17 serial clk recv (grey)
S -20mA serial in 3 - Rec.Data
(red)
T 5 Clear To Send (grn/wht)
U
V EIA RTS 4 Request To Send (wht/org)
W 10 -ve power (wht/grey)
X 22 Ring (blk/org)
Y 9 +ve power (grey/wht)
Z 6 Data Set Ready (wht/grn)
AA +20mA serial out 5 + Trans.Data
(white)
BB 8 Data Carrier Detect (wht/brwn)
CC
DD EIA DTR 20 Data Terminal Ready (blk/blu)
EE -20mA RDR Run 3 - Reader Run
(black)
FF 11 202 Secondary TD (blu/red)
HH
JJ 12 202 Secondary RD (red/blu)
KK -20mA serial out 2 - Trans.Data
(black)
LL 14 EIA Secondary TD (grey/red)
MM 21 Signal Quality (org/blk)
NN 16 EIA Secondary RD (red/brwn)
PP +20mA RDR Run 6 + Reader Run
(black)
RR 23 Signal Rate (grn/blk)
SS
TT +5V DC
UU ground
VV ground
--
Pete Peter Turnbull
Network Manager
University of York