Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90051)

Chapter 1 21

Introduction

How Devices Communicate Once They Are Connected

How Devices Communicate Once They Are

Connected

With the exception of the system console (and, for certain HP 3000

Series 900 models), the remote support modem and the ﬁrst UPS on the

system), which has its own access port, asynchronous devices are

connected to a HP 3000 Series 900 computer through the

Datacommunications and Terminal Subsystem (DTS). DTS includes all

of the Datacommunications and Terminal Controllers (DTCs) connected

to the local area network (LAN), a LAN interface card (LANIC)

connecting each host to the LAN, the LAN cable, and the software that

controls all of the DTS hardware. This software resides on the HP 3000

and on the DTC.

During conﬁguration, a relationship is speciﬁed between the system’s

LANIC and each DTC through which asynchronous device connections

will be made. A link for the LANIC is deﬁned using the Node

Management Conﬁguration Manager (NMMGR) utility. This link

provides the asynchronous devices with an entry point to the DTS.