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Chapter 5. Programming considerations
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5-46
I
Interface for main port
I
i
I
Line Control for main port
Line Speed for main port
Parity for main port
Turnaround Character for main port
Stop Bit for main port
This parameter IS used to specify the communication Interface of the
: main port and applies only to models equipped with the EIA RS-232C
and RS-422A Interfaces
This parameter depends on the type of telecommunication facility and
affects the display station with the EIA RS- 232C Interface only. One of
the following can be selected.
•
Controlled Request To Send (CRTS)
; .
Permanent Request To Send (PRTS)
•
Induced Permanent Request To Send (IPRTS).
If a duplex communication facility is used and the display station is in
duplex operation, the RTS signal must stay on; therefore. this parameter
must be set to either PRTS or IPRTS. Under the same facility. when the
display station is in half-duplex operation, this parameter can be set
CRTS, PRTS, or I PRTS, depending on the host support.
If the half-duplex communication facility is used, the RTS signal must be
controlled; therefore, this parameter must be set to CRTS.
In IPRTS mode, the Clear-To-Send (CTS) and the Data-Set-Ready
(DSR) signals are always regarded as on.
This parameter is used to select the line speed to communicate with the
host. One of the following sixteen (16) speeds is available.
50 bps
75
110
134.5
150 bps
200
300
600
1200 bps
1800
2400
3600
4800 bps
7200
9600
19200
This parameter is used to select the type of parity. In relation to the data
word length (7 or 8-bit selection). the following combinations are valid.
•
7 -bit with no parity
•
7 -bit plus odd parity
•
7-bit plus even parity
•
7-bit plus mark parity
•
7 - bit plus space parity
•
8-bit plus odd parity
•
8-bit plus even parity
•
8-bit plus no parity.
The following combinations of the word length and parity options are
invalid:
•
8-bit and mark parity
•
8-bit and space parity.
This option is used to automatically generate one of the following
turnaround characters at the end of a data steam when a Send or a
Function key is pressed, or a Read command is received:
•
ETX
•
CR
•
EOT
•
DC3 (XOFF).
This parameter is used to select the number of stop bits following a data
word: one (1) or two (2).
(
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