Murata Electronics North America 5811M Manual Do Utilizador
© 2003 Cirronet
Incorporated
25
M-5811-0008 Rev -
6. WIT5811 DEVELOPER’S KIT
The WIT5811 Developer’s Kit contains two self-contained wireless modems (HN-581s) built
around the WIT5811M OEM module. In addition, two WIT5811M OEM modules are
included in the kit. The self-contained units allow developers to get up and running quickly
using standard RS-232 or USB 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 level signals of the serial interface and the
USB interface, the self-contained modems operate exactly as the OEM modules.
The HN-581 will communicate over the USB port if that port is connected to an active USB
device. Otherwise, it will communicate of the RS-232 serial port.
Connection is made to the USB port using the standard USB cable provided. The USB port is
provided to simplify communicating to the WIT5811 module in the HN-581 at the 921,600
bps data rate. While most PCs can support that data rate through a USB port, they are unable
to do so through a standard RS-232 port.
When the HN-581 is powered up and connected to a USB port on the computer, you will be
notified that a new device has been found and will be prompted for the location where the
driver is to be found. Click on the Have Disk button and insert the CD included in the
developer’s kit. Select the drive letter of the CD drive and click continue. The USB drivers
will be installed automatically.
Connection is made to the RS-232 port of HN-581s through a standard DB-9 connector. The
HN-581s 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 WIT5811
does not support software flow control.
When the developer’s kit is shipped from the factory, one HN-581 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 115,200 bps.
The default settings allow 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-
around the WIT5811M OEM module. In addition, two WIT5811M OEM modules are
included in the kit. The self-contained units allow developers to get up and running quickly
using standard RS-232 or USB 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 level signals of the serial interface and the
USB interface, the self-contained modems operate exactly as the OEM modules.
The HN-581 will communicate over the USB port if that port is connected to an active USB
device. Otherwise, it will communicate of the RS-232 serial port.
Connection is made to the USB port using the standard USB cable provided. The USB port is
provided to simplify communicating to the WIT5811 module in the HN-581 at the 921,600
bps data rate. While most PCs can support that data rate through a USB port, they are unable
to do so through a standard RS-232 port.
When the HN-581 is powered up and connected to a USB port on the computer, you will be
notified that a new device has been found and will be prompted for the location where the
driver is to be found. Click on the Have Disk button and insert the CD included in the
developer’s kit. Select the drive letter of the CD drive and click continue. The USB drivers
will be installed automatically.
Connection is made to the RS-232 port of HN-581s through a standard DB-9 connector. The
HN-581s 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 WIT5811
does not support software flow control.
When the developer’s kit is shipped from the factory, one HN-581 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 115,200 bps.
The default settings allow 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-