CXCONFIG(8)

NAME
cxconfig - channel options management utility for Cronyx-Sigma adapter

SYNOPSIS
cxconfig [-a] [<channel> [<option>...]]

DESCRIPTION
The cxconfig utility is used for configuring the channel options of the Cronyx-Sigma adapter.

To change channel options the channel should be free: the corresponding network interface in ``down'' state, the asynchronous terminal device /dev/tty* closed. Generally, the channel options are set up during the operating system startup, for example from the /etc/rc file.

Note, that not all options have a sense for every particular case, and an attempt to set some of them can hang up the channel or the whole adapter.

The following option is available:

-a  Display full information.

Channel options

ispeed=#
    Set the receiver baud rate to the number given. The maximal value is 256000 bits/sec. In the synchronous mode the receiver baud rate is significant only when DPLL mode is used.

ospeed=#
    Set the transmitter baud rate to the number given. The maximal value is 256000 bits/sec. In the synchronous mode the transmitter baud rate is significant only in the case of the internal clock source. If receiver and transmitter have equal data rate, then it could be set by specifying only the numerical argument.

async
    Set the asynchronous channel mode.

hdlc, bisync, bsc, x.21, x21
    Set the synchronous channel mode: HDLC, Bisync (BSC) or X.21.

ppp Set the link-level protocol: PpP/HDLC. The built-in simplified synchronous PPP implementation is used (see RFC-1548, RFC-1549).

cisco
    Set the link-level protocol: Cisco/HDLC (see RFC-1547). This protocol is intended for compatibility with old models of Cisco routers, and with early versions of BSD/386 drivers. The extensive usage of this protocol is not recommended.

ext Use the external link-level protocol suite (for BSD/386 only).

+keepalive, -keepalive
    Enable the automatic line state control sub-protocol. This setting is not significant when the external link-level protocol is used.

+autorts, -autorts
    Enable the automatic RTS signal control. When enabled, the RTS signal goes up only when both halves of the receiver ring buffer are free and ready for receive, and goes down when one or both buffers are busy.

port=rs232, port=rs449, port=v35
    Set the zero channel hardware interface type.

Common options

nrz, nrzi, manchester
    Set the data line signal encoding. In the case of NRZ encoding the zero bit is transmitted by the zero signal level, the one bit - by the positive signal level. In the case of NRZI encoding the zero bit is transmitted by the change of the signal level, the one bit - by the constant signal level. In the case of Manchester encoding the zero bit is encoded as 01 value, the one bit - as 10 value.

+dpll, -dpll
    Enable the digital phase locked loop mode (DPLL). When enabled, the receiver timing clock signal is derived from the received data.

+lloop, -lloop
    Set the local loopback mode.

+extclock, -extclock
    Set the timing clock source of synchronous channels. There are two possible variants: external clock source or internal clock generation.

    External clock mode is the most common method for connecting external modem hardware. In this mode the external timing signal is received on TXCIN pin of the connector, and it is used as a synchronization clock for transmitting data (TXD).

    In the case of internal clock mode the transmitted data (TXD) are synchronized using the internal on-board timing generator, the internally generated timing signal is driven on the TXCOUT pin, and the signal on the TXCIN pin is ignored. This mode is used for direct terminal-to-terminal communication, e.g. for connecting two computers together in a synchronous mode via relatively short cable. This method should also be used for testing channels with an external loopback connector.

fifo=#
    FIFO threshold level setup for receiver and transmitter.

rfifo=#
    Hardware RTS/CTS flow control FIFO threshold setup.

+ctsup, -ctsup
    Enable/disable interrupts on CTS (Clear To Send) signal setup (0 to 1 transition).

+ctsdown, -ctsdown
    Enable/disable interrupts on CTS (Clear To Send) signal clear (1 to 0 transition).

+cdup, -cdup
    Enable/disable interrupts on CD (Carrier Detect) signal setup (0 to 1 transition).

+cddown, -cddown
    Enable/disable interrupts on CD (Carrier Detect) signal clear (1 to 0 transition).

+dsrup, -dsrup
    Enable/disable interrupts on DSR (Data Set Ready) signal setup (0 to 1 transition).

+dsrdown, -dsrdown
    Enable/disable interrupts on DSR (Data Set Ready) signal clear (1 to 0 transition).

Asynchronous mode options

cs# Select character size: 5, 6, 7 or 8 bits.

parodd, pareven
    Parity mode: odd or even.

+ignpar, -ignpar
    Disable/enable parity detection.

nopar
    Disable parity bit generation.

forcepar
    Force parity: even - 0, odd - 1.

stopb1, stopb1.5, stopb2
    Use 1 or 1.5 or 2 stop bits per character.

+dsr, -dsr
    Use the DSR input signal as receiver enable/disable.

+cts, -cts
    Use the CTS input signal as transmitter enable/disable.

+rts, -rts
    Drive the RTS output signal as transmitter ready.

+rloop, -rloop
    Set the remote loopback mode.

+etc, -etc
    Enable the embedded transmit commands mode.

+ixon, -ixon
    Enable the hardware XON/XOFF flow control support.

+ixany, -ixany
    Use the hardware IXANY mode support.

+sdt, -sdt
    Detect the spec. characters SCHR1 and SCHR2 in the receive data.

+flowct, -flowct
    Receive the flow control spec. characters as data.

+rdt, -rdt
    Detect the spec. characters in range SCRL..SCRH in the receive data.

+exdt, -exdt
    Detect the spec. characters SCHR3 and SCHR4 in the receive data.

parintr, parnull, parign, pardisc, parffnull
    Action on parity errors:

    Mode
        Action
    parintr
        Generate the receiver error interrupt
    parnull
        Input the NUL character
    parign
        Ignore the error, receive as good data
    pardisc
        Ignore the character
    parffnull
        Input the sequence <0xFF, NUL, character>

brkintr, brknull, brkdisc
    Line break state action:

    Mode
        Action
    brkintr
        Generate the receiver error interrupt
    brknull
        Input the NUL character
    brkdisc
        Ignore the line break state

+inlcr, -inlcr
    Translate received NL characters to CR.

+icrnl, -icrnl
    Translate received CR characters to NL.

+igncr, -igncr
    Ignore received CR characters.

+ocrnl, -ocrnl
    Translate transmitted CR characters to NL.

+onlcr, -onlcr
    Translate transmitted NL characters to CR.

+fcerr, -fcerr
    Process (don't process) the characters, received with errors, for special character/flow control matching.

+lnext, -lnext
    Enable the LNEXT character option: the character following the LNEXT character is not processed for special character/flow control matching.

+istrip, -istrip
    Strip input characters to seven bits.

schr1=#
    The XON flow control character value.

schr2=#
    The XOFF flow control character value.

schr3=#
    The SCHR3 spec. character value.

schr4=#
    The SCHR4 spec. character value.

scrl=#, scrh=#
    The spec. character range (inclusive).

lnext=#
    The LNEXT spec. character value.

HDLC mode options

if# The minimum number of flags transmitted before a frame is started.

noaddr
    No frame address recognition.

addrlen1, addrlen2
    Address field length: 1 or 2 bytes.

addr1, addr2
    Addressing mode: 4x1 bytes or 2x2 bytes. Registers RFAR1..RFAR4 should contain the address to be matched.

+clrdet, -clrdet
    Enable/disable clear detect for X.21 protocol support.

+dsr, -dsr
    Use the DSR input signal as receiver enable/disable.

+cts, -cts
    Use the CTS input signal as transmitter enable/disable.

+rts, -rts
    Drive the RTS output signal as transmitter ready.

+fcs, -fcs
    Enable/disable the frame checksum generation and checking.

crc-16, crc-v.41
    Select the CRC polynomial: CRC-16 (x^16+x^15+x^2+1) or CRC V.41 (x^16+x^12+x^5+1).

fcs-crc-16, fcs-v.41
    Frame checksum preset: all zeros (CRC-16) or all ones (CRC V.41).

+crcinv, -crcinv
    Invert (ie. CRC V.41) or don't invert (ie. CRC-16) the transmitted frame checksum.

+fcsapd, -fcsapd
    Pass the received CRC to the host at the end of receiver data buffer.

idlemark, idleflag
    Idle mode: idle in mark (transmit all ones) or idle in flag (transmit flag).

+syn, -syn
    Enable/disable sending pad characters before sending flag when coming out of the idle mode.

pad#
    The number of synchronous characters sent (0..4).

syn=0xaa, syn=0x00
    Send sync pattern.

rfar1=#, rfar2=#, rfar3=#, rfar4=#
    Frame address registers for address recognition.

EXAMPLES
Set up the channel 7 of the adapter Sigma-400 under FreeBSD. Physical 4-wire leased line with Zelax+ M115 short-range modems. Synchronous mode, 128000 bits/sec, interface RS-232, protocol PpP/HDLC without keepalive support, NRZI encoding, DPLL mode, no flow control:

    cxconfig cx7 128000 hdlc ppp -keepalive nrzi -cts +dpll -extclock
    ifconfig cx7 158.250.244.2 158.250.244.1 up

Set up the channel 0 of the adapter Sigma-100 under FreeBSD. Attachment to the near computer by short cable, internal clock source. Synchronous mode, 256000 bits/sec, interface RS-232, protocol Cisco/HDLC with keepalive support:

    cxconfig cx0 hdlc 256000 cisco +keepalive -extclock
    ifconfig cx0 200.1.1.1 200.1.1.2 up

Set up the channel 1 of the adapter Sigma-840 under BSD/386. Synchronous 64 kbit/sec leased line, external clock source. Synchronous mode, interface V.35, external protocol suite:

    cxconfig cx1 hdlc ext
    ifconfig cx1 193.124.254.50 193.124.254.49 multicast up

Set up the channel 0 of the adapter Sigma-840 under FreeBSD. Attachment to the Cisco-4000 router by null-modem cable, internal clock source. Synchronous mode, 64000 bits/sec, interface RS-232, protocol PpP/HDLC with keepalive support and flow control, LCP and IPCP protocols (see RFC-1548 and RFC-1332) debug tracing enabled:

    cxconfig cx0 hdlc 64000 port=rs232 ppp +keepalive -extclock +cts
    ifconfig cx0 100.0.0.2 100.0.0.1 debug up

FILES
/dev/cronyx the special device file for adapter options management

SEE ALSO
cx(4)