Agilent Technologies Z5623A manual Using the Control Lines Connector

Advanced Topics

Using the Control Lines Connector

Using the Control Lines Connector

The Control Lines connector allows the test set to control other equipment. See Figure 7-1, “Control Lines,” on page 7-7for a diagram of the connector. The diagram identifies the ground pin and the pin that is associated with each of the five control lines (C1 through C5). (Notice that the connector has three unused pins.)

The connector is driven by open-collector output drivers within the test set. The drivers cannot source any current. Therefore, the user must provide an external power supply and some additional circuitry in order to use the connector. The next paragraph describes the absolute maximum limits associated with the connector. The remainder of the section describes possible ways of implementing the additional circuitry needed in order to use the connector.

Each control line on the test set can be independently set to either the “Open” state or the “Low” state. In the “Open” state, the voltage on the line will be set by the external power supply. This voltage must not exceed +22 Vdc. In the “Low” state, the voltage on the line will be about +0.63 Vdc. In the “Low” state, the drive circuitry can sink a maximum of 250 mA per control line.

Control Line Commands for 9-Pin Connector:

Figure 7-1 on page 7-7presents a diagram of the 9-pin connector and identifies the control lines (C1 through C5). To set the control lines, send the test set a number (either binary or decimal) specifying the state of all five lines. The binary number has the following format:

0 0 0 C5 C4 C3 C2 C1

Note that three leading zeroes are required. Note, also, that a 1 for a given control line specifies a low (+0.63 V) and a 0 specifies an open. For example, if the test set has an address of 12, the following command will set C3 and C1 low, and C5, C4, and C2 high:

OUTPUT 712;"00000101;" ! sets C5-C1 to OOLOL

The decimal equivalent of the binary number can also be used:

OUTPUT 712;"5;" ! sets C5-C1 to OOLOL

Table 3-3 on page 3-10lists all possible combinations of control line states. For each combination, the table lists the binary and decimal numbers required to command that combination.

7 -6 Agilent Technologies Z5623A Option H48