syncinit(1M) System Administration Commands syncinit(1M)NAMEsyncinit - set serial line interface operating parameters
SYNOPSIS
/usr/sbin/syncinit device [ [baud_rate] | [keyword=value,...] | [sin‐
gle-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 elec‐
trically disconnected from the DCE
receive data input and tied to the
outgoing transmit data line. Transmit
data is available to the DCE. The Dig‐
ital 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 loopback mode. If no
other clocking options have been spec‐
ified, 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 disconnected from the
transmitter and tied to the receive
data input. Incoming receive data is
still visible. Use of this mode in
combination with local loopback 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
encoding.
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 out‐
put 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 out‐
put of the DPLL circuit.
speed integer Set the baud rate to integer bits per
second.
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
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Availability │SUNWcsu │
└─────────────────────────────┴─────────────────────────────┘
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 accompa‐
nied 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.
SunOS 5.10 9 Mar 1993 syncinit(1M)
