HOWTO on connecting one 3153 terminal between two RISCs.
DESC: The customer has two RISC boxes, each with it's own IBM 3153
terminal, emulating wyse60. The customer has attempted to use
the aux-port on the back of one of the 3153s to connect to the
second RISC. He is following the manual setup on page 2-8 and
is not having success. See the diagram below.
_____ AUX ______
|3153 |================>| |
|RISC | PORT |RISC |
ACT: To setup one 3153 terminal between two RISC boxes.
The EIA port (port 1) on the back on the 3153 was used for the
connection to HOST-1. The AUX port (port 2) was used to connect
*** IMPORTANT NOTE ***
The AUX port is internally configured for DCE devices! Thus,
when connecting a DTE device (i.e. another RISC, serial printer,
terminals) DO NOT use an interposer/null-modem.
I then hit control+minus key (on the number key-pad) to enter the
setup for the 3153. Under the F1 key, I set "sessions=two" and
saved this setting when exiting setup via "control+scroll-lock".
I verifed that I did indeed have two sessions by cycling from one
to the another by pressing "control+enter" and noting the session
number at the bottom left of the screen.
I then returned into the setup on the 3153 for session one.
Now I selected the port to be used for connection to HOST-1
as the EIA port. (NOTE - the EIA port is internally configured
for DTE deives, thus, when connecting another DTE device to
this port, an interposer/null-modem cable or adapter is needed).
I selected "Host/Printer" to use "EIA/None". (the "none" means
no printer will be using a port durning activities under session
I saved this setting upon exiting setup.
I then switched to session two. Again, I went into setup. I set
"Host/Printer" to use "AUX/None". I again saved this setting when
I then defined the tty definations on both RISC boxes and made
sure these definitions matched EXACTLY to the baud, parity,
bata bits, etc.... defined by the 3153, under it's setup.
I "penabled" both ttys (to have a getty running) and I was able
to login and switch from one RISC to the other.... all while
using the same IBM 3153 terminal.
ACT: I called the customer. He asked how I knew the AUX port was
configured for DCE devices. I stated that on page 1-10 and 1-11
on the User's Guide did report the AUX port was configured for
DCE devices... and on page 2-8, the diagram (poor as it is) did
show the interposer on the EIA port.
Support Line: HOWTO on connecting one 3153 terminal between two RISCs. ITEM: BA8634L
Dated: October 1995 Category: N/A
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