DL232.ART ·
ART ·
5.3 KB ·
1980-01-01 ·
from CompuLink-User-Group_Magazette_Vol-2-Issue-1_1986
DL-232 -- A New Standard
by Dave Lyons (CompuCenter Iowa: JoeApple;
CompuServe 72177,3233)
I may never understand how the designers of the RS-232 "standard"
for serial communication managed to use 25 wires where only 3 are
really necessary. Maybe they made a deal with the companies that make
cables, connectors, and switch boxes. I just don't know.
Well, I thought of a few things that the RS-232 standard lacks, and
since there are already so many extra signals, a few more can't hurt
anybody, right? Heck, let's go for 50-pin connectors and cables and
add the following new signals. (Just to make sure this isn't
compatible with any old equipment, all OLD signals are moved up one pin
number (Carrier Detect becomes 9 instead of 8, etc., and pin 25 goes to
pin 1).
Pin Name Description
--- ---- -----------
26 XCAT Should be connected to chassis of devices. Used
with the next two signals, this provides protec-
tion against cats who haven't learned not to walk
on floppy disks or serial equipment. This signal
should supply about 2000 volts (at a VERY low
current level; wouldn't want to HURT the cute
little thing, just teach it not to walk on
anything in the computer room).
27 CATGND Cat ground. Used with pin 26. This signal
should be connected to another part of the
chassis or the tabletop.
28 CTD Cat detect.
29 SD Self-destruct. This signals causes the device to
destroy itself.
30 SDACK Self-destruct acknowledge. Acknowledges that the
device has destroyed itself.
31 VADIC This signal indicates to a computer that the
device on the other end is a modem that uses
VADIC protocol. (Note: CompuCenter Iowa users
should jumper this signal to SD and then buy a
decent modem.)
32 STBIT1 Stutter bits. With pin 33, sets the number of
"stutter bits" (0 to 3 of them) to be included
before each byte transmitted. This may reduce
the number of people who feel inferior to compu-
ter equipment by showing them that computers have
problems communicating with each other.
33 STBIT2
34 CABR Cable ready. It's not enough to know that the
Data Set is ready (DSR) and the Data Terminal is
read (DTR). We also need to know that the CABLE
connecting them is ready.
35 GRR Gremlins ready. Not everybody knows it, but
there are little green guys inside most modern
computer equipment. Most of the time they sleep,
but other times they cause trouble. The next 6
signals are for dealing with gremlins.
36 220A Used with pin 37, supplies 220 volt power for the
gremlins' air conditioning. On hot days when
37 220V gremlins can't sleep, applying power to these
pins may solve your problems.
38 110H 110 volts, hot side. When the 220 volt power
doesn't help and gremlin problems persist, use
39 110N this with pin 39 to supply 110 volts for the
gremlins' TV and video game center.
40 MOON Indicates the phase of the moon. Sometimes
solves mysterious problems.
41 LHI Pins 41 through 45 can be used to implement the
"like" protocol when the normal RTS/CTS protocol
isn't enough. This one means "Like HI" and is
used to establish a connection.
42 LHTY2 Like HI to You Too. Acknowledges pin 41.
43 LLTT Like Listen To This. Requests permission to send data
44 LOK Like OK. Grants permission to transmit data.
45 LWOW Like WOW. Acknowledges receipt of data.
46 HEY Pins 46 to 50 may be used to implement the
"Eighties" protocol when RTS/CTS and "Like"
protocols won't do the job. This signal is
similar to RTS (Request to Send).
47 NP No Problem. Acknowledges HEY.
48 HUH? Signals that data was not received correctly
(possibly wrong number of stutter bits).
49 YEAH Acknowledges data received.
50 KMG365 Like YEAH, but for avid Emergency One fans.
That makes 50! Let's hear your suggestions for MORE serial
signals. Maybe we can get 100 and REALLY make the cable
manufacturers happy.