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Models IC and SIC
Note: To have the capability to operate in either full-speed or half-speed mode, two
system diskettes may be generated (as described in Chapter 6), one for full-speed
operation and one for half-speed operation. To switch modes, select the other system
diskette and perform IML procedures. Ensure that diskettes are appropriately labeled.
321 EBCDIC or ASCII Character Set
331 BSC or SDLC Protocol
Enter a 0 if the EBCDIC character set is used or a 1 if the ASCII character set is used
(available in the U.S. only).
Enter a 0 if the BSC protocol is used or a 1 if the SDLC protocol is used.!
342 Request to Send (RTS) Control (2-Wire or 4-Wire)
SDLC:
2-wire: Enter a O.
4-wire: Enter a 1.
BSC:
2-wire: Enter a O.
4-wire: If your host modems use the New SYNC feature, enter a O. If you desire RTS
from selection to end of transmission (EOT) , enter a 1. (Be aware that
entering a 1 may cause communications errors. If in doubt, enter a 0.)
Note: Entering a 1 here and also in response to sequence number 314 will provide
permanent R IS.
343 Communications Interface Options
Enter a 0 if External Model Interface feature (EMI) #3701 is installed. Enter a 1 if the
DDS Adapter feature (#5650 for point-to-point or #5651 for multipoint operation) is
installed. Enter a 2 if X.21 Leased is installed.
351 HPCA (SDLC Only) or CCA Adapter
Enter a 0 if the CCA Adapter feature (#6302) is installed or a 1 if the HPCA Adapter
feature (#6303) is installed.
352 Encrypt/Decrypt (SDLC Only)
900 Entry Acceptance
3-26
Enter a 0 if the ·Encrypt/Decrypt feature (#3680) is notinstalled or a 1 if it is.
Sequence number 900, which appears as part of the sequence number 999 display,
prompts the operator to enter a 1 if, after the entries are verified, all the responses are
entered correctly. If incorrect responses are detected by the 3274, the 1 is automatically
changed back to a 0 by the 3274, an operator code is displayed for the incorrect
information, and incorrect entries are intensified.
1
This parameter must be compatible with the host system communications
controller and/or the modem.
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