Hp-Hil Interface/Devices - HP 340 Series Service Manual

Table 3-2. Interface Configuration Switches
MEN
REM
Switch
Label Function/How
It's
Used
MEN RS-232 Modem Enable
1
=
Modem lines enabled (Shipped setting)
o =
Modem lines disabled
REM RS-232 Remote Terminal Enable
1
=
Remote Mode
o =
Local Mode (Shipped setting)
LAN LAN Local/Remote
1
=
Remote Mode (not currently used)
o =
Local Mode (Shipped setting)
SC
Internal HP -IB System Controller
1
=
System Controller (Shipped setting)
o =
Not System Controller
HP-HIL Interface/Devices
Overview
Hewlett-Packard Human Interface Link (HP-HIL) is an HP standard for interfacing certain HP
cornputers and SPUs to human input devices. Asynchronous serial communications protocol
enables you to select a set of input devices, connect them to your SPU, and work with any
application program.
A link controller on the processor board controls the HP-HIL. Each HP-HIL device has an
circuit to interface information to and from the device. Limitations for the HP-HIL are:
• Up to seven devices can be on the link.
• Maximum distance between devices is 2.4 metres, total link maximum length is 16.8
metres. This does not include the 15 or 30 metre extensions.
• Series 300 Maximum link current is 1 A.
52
Functional Description