ZEPIR0BAS02MODG datasheet(20/78 Pages) ZILOG

20 / 78 page

PS030504-0917

Serial Interface Mode

ZMOTION® Detection Module II

Product Specification

Sleep Mode in Serial Interface Mode

For applications in which motion detection is not always required, the Sleep signal can be

used to put the device into a low-power mode. The advantage of this feature vs. removing

power from the Module is that the PIR stabilization time is much shorter.

If the Sleep (SLP) input signal is driven Low, the device enters a low-power Sleep Mode

and is awakened by either deactivating the signal (driving the signal High) or sending a

character over the serial interface; the character is received and processed.

Serial Interface Commands and Description

The Serial Interface operates as a Host/Client relationship in which the Module is the cli-

ent. Commands are sent from the Host and the Module responds with the requested infor-

mation or confirmation. The only exception is when the Module is configured for MD

Unsolicited operation. In this mode, the Module will send Motion Detected information

without first receiving a command from the host. All commands sent to ZDMII are in

ASCII character format; however, the data sent to and from the Module may be in ASCII

or decimal formats.

There are three types of command structures accepted by ZDMII; each is described in this

section.

• Read commands

• Write commands

• Confirmation commands

Read Command Structure

Read commands are used to request information from ZDMII, and are sent from the Host.

The Module responds with the requested data.

• All Read commands are initiated by single lower-case letters.

• When a Read command is received, the Module returns the applicable value, as de-

scribed in the Serial Commands chapter on page 15. See the example in Figure 5.

Figure 5. Read Command Structure

Command

Response

Host

ZDM II Module

ZEPIR0BAS02MODG Datasheet(PDF) 20 Page - Zilog, Inc.