Hp-Ib Connector; Hp-Ib Logic Levels; Hb-Ib Connector - HP 8112A Operating, Programming And Servicing Manual

HP-IB Connector

S H I E L D (GNO O N L Y A T

HP-IB Logic Levels

Caution
CONTROLLER)
Figure 3-3. HB-IB Connector
The rear panel HP-IB connector (Figure 3-3), is compatible with
the connector on Cable Assemblies 10833A, B, C and D. If a cable
is to be locally manufactured, use male connector, HP part number
1251-0293.
The HP 8112A HP-IB lines use standard TTL logic, the levels being
as follows:
True = Low = digital ground or 0 Vdc to 0.4 Vdc,
n
False = High = open or 2.5 Vdc to 5 Vdc.
n
All HP-IB lines have LOW assertion states. High states are held at
3.0 Vdc by pull-ups within the instrument. When a line functions
as an input, approximately 3.2 mA of current is required to pull it
low through a closure to digital ground. When a line functions as an
output, it will sink up to 48 mA in the low state and approximately
0.6 mA in the high state.
The HP-IB line screens are not isolated from ground.
Installation 3-5