US Robotics COURIER HST User'smanual page 106

COURIER HST
APPENDIX E-5
HEWLETT PACKARD INSTALLATIONS
The Courier HST recognizes the ASCII ENQ/ ACK charac-
ters exchanged between the Hewlett Packard host computer
and its terminals. The HP host sends the terminal an ENQ
character at predefined intervals, and sends no more data
until the terminal responds with an ACK character.
Courier HST modems manage this ENQ/ ACK protocol so
that communication is speeded up, thereby enabling HP
terminals to achieve high speeds on dial-up lines. Special
Received Data flow control settings (the &I command)
are required for HP users.
Follow these guidelines:
1. Use one of the &I settings given here for both Normal
and error control (ARQ) sessions, i.e., for all &M
settings.
2. Do not use a software setting for Transmit Data flow
control. Set the modem only to &H0 or &HI, according
to the guidelines in Chapter 4.
3. Set the Courier HST to Host Mode if it is attached to the
host computer, or to Terminal Mode if it is attached to
a terminal:
Host Mode
Terminal Mode
AT&l3
<er>
AT&l4
<er>
E-5.1