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3 - Installation
Digital I/O Connections
As shown in Table 3-3 and Figure 3-5, the FLT/INH connector can also be configured as a digital I/O
port. Information on programming the digital I/O port is found in chapter 5 and under
[SOURce:]DIGital:DATA and [SOURce:]DIGital: FUNCtion commands in the Programming Guide.
The electrical characteristics of the digital connector are described in appendix A.
PIN
1
2
3
4
NOTE: Connectors
are removable
INH
FLT
. . . .
+
-
+
A) Relay Circuits
Controller Connections
The dc source connects to a controller either through an GPIB or an RS-232 connector.
GPIB Interface
Each dc source has its own GPIB bus address, which can be set using the front panel
described in chapter 5. GPIB address data is stored in non-volatile memory. The dc source is shipped
with its GPIB address set to 5.
Dc sources may be connected to the GPIB interface in series configuration, star configuration, or a
combination of the two, provided the following rules are observed:
28
Table 3-3. FLT/INH DIGital I/O Connector
FAULT/INHIBIT
FLT Output
FLT Common
INH Input
INH Common
+16.5 V Max.
Coil Current
0.25 A Max.
Relay Driver
Ports 0,1,2
Supply contains
4 3 2 1
internal clamp diodes
for inductive flyback.
Figure 3-5. Digital I/O Examples
DIGITAL I/O
Output 0
Output 1
Input/Output 2
Common
External pull-up to 5 V
required for pins 1 & 2.
Digital Output
Ports 0,1, 2
4 3 2 1
Digital Intput
Port 2
4 3 2 1
B) Digital Interface Circuits
TTL, AS,
CMOS, HC
key as
Address
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