IBM RS/6000 manual Xon/Xoff Modems, Ring Detection, Terminal Emulators, Ripo

Switch	Position	Function
11	*Up	AT Responses Enabled (Extended Responses Disabled)
12	*Down	Asynchronous Operation
13	UP	28.8KB	Line	Speed
14	Up
15	Up	CD and	DSR	Normal Functions
16	Up	2-Wire	Leased Line Enabled

*Only switches 11 and 12 are changed from the factory default settings.

Xon/Xoff Modems

Some modems of the mid-80's vintage assume software flow control (Xon/ between the computer and the modem. Modems with this design send e ters during and after the transmitted data. The Service Processor these extra characters. If your configuration includes such a mod results may be unpredictable.

The	sample		modem	configuration	files included in this package do	not
modems,		so	custom	configuration	files would be necessary. Anchor	Autom
2400E	is	an	example of such		a modem.

Most newer modems do not use this design. It is recommended you u newer vintage if you experience unexplainable performance problems t due to Xon/Xoff characters.

Ring Detection

Most

modems

produce

an

interrupt

request each

time

they

detect

a

Some

modems generate an interrupt only on the first ring

signal

they

DataPort

2001

is an

example

of

such

a

modem.

The

Service

Processor

uses

the

ring

interrupt

request

to

count

the

when

Ring

Indicate

Power-On

(RIPO)

is

enabled. If

your

modem

produ

rupt

on only the first ring, set

Ring

Indicate Power-On

to start

o

wise, you

may

choose

to start

Ring

Indicate

Power-On

on

any

ring

your

operation

convenient.

Terminal Emulators

The Service Processor is compatible with simple ASCII terminals, and patible with most emulators. It is for the cases when a remote s from the Service Processor to the operating system that agreeing t becomes important.

Appendix C. Modem Configurations-5