X25AM Programming Manual

ITI Applications
X25AM Programming Manual—527201-001
2-19
Disposition of Terminal Control Characters by ITI
The characters mean the following:
ITI reassembles all of the data into a block that is transferred all at once to the
application buffer. The number of characters that is transferred is specified by READ
COUNT. If there are more characters than READ COUNT in the reassembled block,
the extra characters are discarded.
Parity and ITI
Parity only applies to conversation mode. Parity even, odd, or none is a requirement of
networks and terminals. The parity standard is specified for ITI with the SCF subdevice
attribute PARITY, as follows:
PARITY: EVEN/ODD/NONE
PARITY can be set and/or altered with SETMODE 24.
ITI strips or does not strip the parity bit according to the specifications of the SYSGEN
X25AM macro modifiers, as follows:
ITI checks the parity bit according to the specifications of the SYSGEN X25AM macro
modifier:
PARITYCHK can be set and/or altered with SETMODE 10.
SOH Terminal sends function key string
Terminal returns status
Terminal returns cursor address
STX Start of text
sequence number Sequence number for each successive text block
ETX End of text, end of nontext
LRC Longitudinal Redundancy Check checksum character
SYSGEN Modifier Description
STRIPPARITY The parity bit is set to 0 by ITI before the character is
placed into the buffer that will be transferred to the
application. PARITY must be EVEN or ODD.
NOSTRIPPARITY The parity bit is left alone.
SYSGEN Modifier Description
PARITYCHK Enables parity checking. PARITY must be EVEN or
ODD.