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4.0 OPERATION

The M221 is a register-based instrument that is controlled through a series of I/O registers

described in Section 3.2.1. The exact method of accessing and addressing the I/O registers is

dependent on the M-Module carrier used to interface the module to your data acquisition or test

system. Refer to the carrier’s documentation for information on the address mapping of an M-

Module’s I/O registers and to your system software documentation for details on data access.

Typically a high level driver is available to aid in control of the module. Refer to the software

driver documentation for instructions on using the driver.

4.1 RELAY OPEN/CLOSE

Each relay channel can be separately controlled with the Relay Register (Reg. 0x14). Writing a 1

to a bit will OPEN the relay (i.e., connect the common terminal to the normally closed terminal)

and writing a 0 to a bit will CLOSE the relay (i.e., connect the common terminal to the normally

open terminal) as shown in Figure 4.

Figure 4. Effects of Opening/Closing Relay

4.2 INTERRUPTS

The M221 can generate an interrupt request 13ms after a relay is opened or closed indicating that

the relay has settled. The interrupt must be enabled in the Control Register (Reg. 0x02).

The module releases the interrupt request during the interrupt acknowledge cycle (ROAK or

hardware-end-of-interrupt type interrupt). M-module carriers and system controllers treat the

interrupts differently. Refer to your carrier and controller documentation to determine how to

properly configure them to handle the M224 M-module interrupt request.

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C&H Technologies M 2 2 0 Bedienungsanleitung Seite 17