SYNCINIT(1M)SYNCINIT(1M)NAME
syncinit - set serial line interface operating parameters
SYNOPSIS
/usr/sbin/syncinit device
[ [baud_rate] | [keyword=value,]... | [single-word option]]
DESCRIPTION
The syncinit utility allows the user to modify some of the hardware
operating modes common to synchronous serial lines. This can be useful
in troubleshooting a link, or necessary to the operation of a communi‐
cations package.
If run without options, syncinit reports the options as presently set
on the port. If options are specified, the new settings are reported
after they have been made.
OPTIONS
Options to syncinit normally take the form of a keyword, followed by an
equal sign and a value. The exception is that a baud rate may be speci‐
fied as a decimal integer by itself. Keywords must begin with the value
shown in the options table, but may contain additional letters up to
the equal sign. For example, loop= and loopback= are equivalent.
The following options are supported:
Keyword Value Effect
loop yes Set the port to operate
in internal loopback
mode. The receiver is
electrically discon‐
nected from the DCE
receive data input and
tied to the outgoing
transmit data line.
Transmit data is avail‐
able to the DCE. The
Digital Phase-Locked
Loop (DPLL) may not be
used as a clock source
in this mode. If no
other clocking options
have been specified,
perform the equivalent
of txc=baud and
rxc=baud.
no Disable internal loop‐
back mode. If no other
clocking options have
been specified, perform
the equivalent of
txc=txc and rxc=rxc.
echo yes Set the port to operate
in auto-echo mode. The
transmit data output is
electrically discon‐
nected from the trans‐
mitter and tied to the
receive data input.
Incoming receive data
is still visible. Use
of this mode in combi‐
nation with local loop‐
back mode has no value,
and should be rejected
by the device driver.
The auto-echo mode is
useful to make a system
become the endpoint of
a remote loopback test.
no Disable auto-echo mode.
nrzi yes Set the port to operate
with NRZI data encod‐
ing.
no Set the port to operate
with NRZ data encoding.
txc txc Transmit clock source
will be the TxC signal
(pin 15).
rxc Transmit clock source
will be the RxC signal
(pin 17).
baud Transmit clock source
will be the internal
baud rate generator.
pll Transmit clock source
will be the output of
the DPLL circuit.
rxc rxc Receive clock source
will be the RxC signal
(pin 17).
txc Receive clock source
will be the TxC signal
(pin 15).
baud Receive clock source
will be the internal
baud rate generator.
pll Receive clock source
will be the output of
the DPLL circuit.
speed integer Set the baud rate to
integer bits per sec‐
ond.
There are also several single-word options that set one or more para‐
maters at a time:
Keyword Equivalent to Options:
external txc=txc rxc=rxc loop=no
sender txc=baud rxc=rxc loop=no
internal txc=pll rxc=pll loop=no
stop speed=0
EXAMPLES
Example 1 Using syncinit
The following command sets the first CPU port to loop internally, using
internal clocking and operating at 38400 baud:
example# syncinit zsh0 38400 loop=yes
device: /dev/zsh ppa: 0
speed=38400, loopback=yes, echo=no, nrzi=no, txc=baud, rxc=baud
The following command sets the same port's clocking, local loopback and
baud rate settings to their default values:
example# syncinit zsh0 stop loop=no
device: /dev/zsh ppa: 0
speed=0, loopback=no, echo=no, nrzi=no, txc=txc, rxc=rxc
SEE ALSOsyncloop(1M), syncstat(1M), intro(2), ioctl(2), attributes(5), zsh(7D)DIAGNOSTICS
device missing minor device number
The name device does not end in a decimal number that can be used
as a minor device number.
bad speed: arg
The string arg that accompanied the speed= option could not be
interpreted as a decimal integer.
Bad arg: arg
The string arg did not make sense as an option.
ioctl failure code = errno
An ioctl(2) system called failed. The meaning of the value of errno
may be found in intro(2).
WARNINGS
Do not use syncinit on an active serial link, unless needed to resolve
an error condition. Do not use this command casually or without being
aware of the consequences.
Mar 9, 1993 SYNCINIT(1M)
