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Operating and Programming 3
L4400 User’s Guide 51
Ext Trig/Alarms/DIO Port
The external trigger, alarms, and DIO port enables you to synchronize
scanning between a switching instrument such as the L4421A and an
external DMM. The port also allows you to output alarm signals to an
external device or control system. Figure 3- 4 shows the pin out and signal
definitions for the port.
Figure 3-4. External Trigger and Alarm Port Pin Definitions.
GPIB Connector
The GPIB interface is available on all L4400 series instruments as
Option- GPIB. This option must be purchased with the product. Products not
ordered with the GPIB interface cannot be reconfigured to add it later.
LAN Port
The LAN port on the L4400 series instruments supports 10 Mbps and 100
Mbps data transfer rates (10BaseT/100BaseTx). The port is Non Auto- MDIX
which means that the LAN crossover cable supplied with the instrument
Input
5 V
0 V
> 1 µs
Output
3.3 V
0 V
Approx. 2 µs
External Trigger Usage
Alarm Usage
5
1
9
6
Alarm 1 output (pin 1)
Alarm 2 output (pin 2)
Gnd (pin 9)
Channel closed output
(Trig Out - pin 5)
Gnd (pin 9)
Channel advance input
(Trig In - pin 6)
5
1
9
6
or