Integration Guide

WIT2410

6. WIT2410 DEVELOPER’S KIT

The WIT2410 Developer’s Kit contains two self-contained wireless modems (HN-510s)

built around the WIT2410M OEM module. In addition, two WIT2410M OEM modules

are included in the kit. The self-contained units allow developers to get up and running

quickly using standard RS-232 interfaces without having to build a CMOS level serial

interface. In addition, the self-contained modems include status LEDs to provide modem

status information visually. The built-in battery pack allows the developer to use the

modems without being tethered to a power source. This provides a simple way to test the

range of the radios. Other than the true RS-232 signals of the serial interface, the self-

contained modems operate exactly as the OEM modules.

Connection is made to the HN-510s through a standard DB-9 connector. The HN-510s

are set up as DCE devices requiring the use of a straight-through cable to connect to DTE

devices. The pinout is provided in Section 7.3. The modems can be used with just a

three wire connection. Transmit data, receive data and ground are the three required

connections. Note that in this configuration, no flow control is available as the WIT2410

does not support software flow control.

When the developer’s kit is shipped from the factory, one HN-510 is set up as a base

station and the other is set up as a remote. The interface rate for both modems is set at

9600 bps. The default setting for the network key allows the modems to communicate

without changing any settings. As a quick test, separate the two modems by about 5 feet,

plug in the power and turn the modems on. Do not connect the modems to any device.

The Carrier Detect (CD) LED on the base station will come on immediately. After a few

seconds, the CD LED on the remote will come on. This indicates that the modems have

synchronized and have established a communications link.

An important point to remember is that if the base station is in Sleep mode, no

communications can take place until (1) the base station is taken out of sleep mode and

(2) the remote has synchronized with the base station. As the Sleep signal is brought out

on the pin usually occupied by DTR, connecting the base station to a PC serial port with

DTR de-asserted will put the modem into sleep mode. Some communications programs

will attempt to communicate immediately after asserting DTR. The base station will

transmit this data, but the remote will not be synchronized with the base station and will

not receive the transmission. In this instance, do not connect the Sleep signal to DTR of

the serial port.