Xerox 4235, Руководство по планированию установки

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SYSTEM CONFIGURATION
XEROX 4235 LPS INSTALLATION PLANNING GUIDE 6–23
Table 6–6. Serial system configuration options–asynchronous (continued)
Settings Options
(defaults appear bold) Description
Interface signals DTR
DSR
DTR & DSR
None
The DTR (Data Terminal Ready) option causes the DTR line to
go low (negative, false) when the space in the input buffer is
less than that of 64 characters. The line goes high (positive,
true) when the 4235 LPS is ready to receive data. If this option
is not in effect, the Data Terminal Ready line remains high at
all times.
Note: This option is designed to be used with direct connect
interfaces from a host computer system or PC.
When the DSR (Data Set Ready) option is enabled, the 4235
LPS polls the Data Set Ready signal from the host every .5
seconds. If DSR is low two times in a row, the link is broken,
DTR is dropped for five seconds and then raised again.
Note: This option is designed to accommodate European
switched line configurations.
When this is selected, both options are active, and DSR is
polled every .5 seconds. If DSR is low two times in a row,
DTR is dropped and held low for five seconds, then raised
again. DTR is also dropped when the 4235 LPS is not ready to
receive data, and it is raised when the 4235 LPS is ready.
When this is selected, both options are inactive.
Line/modem settings Full duplex
Half duplex
Typically, leased lines are full duplex, while switched lines are
half duplex. The DTR option is not recommended for half
duplex operation, since dropping DTR causes a dialup modem
to disconnect.
Parity
Odd
Even
None
Odd, even, or no parity may be chosen. If no parity is chosen,
the 4235 LPS does not expect a parity bit.
Stop bits One
One and one half
Two This is the number of stop bits that the 4235 LPS expects after
each character.
Auto disconnect Enable
Disable When enabled, the 4235 LPS disconnects the communication
line by dropping DTR if it receives no data for 30 seconds. If
the DSR option has been enabled, DTR remains low until DSR
is also dropped; DTR is then raised again.
Note: The Auto Disconnect option is designed to
accommodate European switched line configurations.
Hold line period 60 The hold line period defines the length of inactivity allowed
during communications before the 4235 LPS disconnects. You
can specify a hold line period of up to 999 seconds.
Data monitor Enable
Disable When data monitor is enabled, the hexadecimal value of all
received character codes and functions are printed in the order
received. Data monitor is not supported in XPPM; however, a
data monitor of XPPM jobs is possible if you send an XPPM
job to a port configured for XDPM with the data monitor
enabled.
Table 6–6.
Serial system configuration options–asynchronous (continued)