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Configuring the Terminal
Table 3-4. Datacomm Configuration Menu Fields (Continued)
The LRC is an 8-bit checksum (one character), of which each
bit is obtained by exclusive tcOR"ing the associated bits of all
characters included in the text block. If the ((Code" field is
ASCI
17,
then a parity bit is added to this character when it is
transmitted. If the ((Code" field is
ASC
I
18,
the eighth (high
order) bit is obtained in the same way as the other seven bits,
because parity is not used with 8-bit codes.
The CRC is a 16-bit checksum (two characters) that is com-
patible with the CRC16 used by IBM in their Binary
Synchronous communications protocol. Of the two, CRC is the
more reliable; it can detect errors undetectable by LRC.
Values: CRC
LRC
Default=CRC
SR(CH)
RecvPace
(Pt-to-pt
only)
3-20
This field specifies the desired state of the RS-232C SR line
'when the terminal's power is first turned on or when the
terminal is reset. The SR line, RS-232C pin number 23, is
defined as the Data Signal Rate Detector (DTE Source). It is
normally used on dual speed modems to select the appropriate
speed (single speed modems merely ignore this line).
Values:
Hi
La
Default=Lo
Receive pacing is a mechanism by which the terminal auto-
matically controls (halts and resumes) the transmission of
data from the remote device. For the Full Duplex Modem
menu, there is only one means of performing receive pacing:
by using the XON and XOFF control codes. The Full Duplex
Hardwired menu has the TR(CD) option in addition to the
XON and XOFF control codes.
Receive pacing selected through this field is different from,
and independent of,
ENQ/ACK
pacing.
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