User`s guide

Dolphin® 7900 User’s Guide Rev F
10/16/07
13 - 7
RS-232 Communications
Connecting the Cables
Connect the HomeBase to the host computer or other device by plugging an RS-232 serial cable into the RS-232 Port (see page
13-3) on the back panel. The wiring of your cable depends on whether the other device is set up as a Data Communications
Equipment (DCE) or Data Terminal Equipment (DTE) device.
The HomeBase communication port is configured as a DCE device. To communicate with a DCE device, use either a null modem
adapter in line with a standard RS-232 cable, or a null-modem serial cable. To communicate with a DTE device such as a PC,
use a standard (or straight-through) RS-232 cable.
You can make your own cables by following the pin configuration in the chart below. To do so, you must determine if your host
RS-232 device is 9-pin or 25-pin, and whether it is configured as a DCE or DTE device.
RS-232 Pin Configuration
Note: The HomeBase cannot be daisy-chained.
Setting up the Terminal for ActiveSync Communications via RS-232
Tap Start > Programs > ActiveSync > Menu and verify that ‘115200 Default is selected as the connection method.
Setting up the PC for ActiveSync Communications
ActiveSync must be installed and configured for RS-232 on the desktop computer to sync successfully with a Dolphin terminal
that is configured for RS-232 communication. Verify that ActiveSync on the PC has the correct ActiveSync Connection Settings.
Open ActiveSync and click File > Communication Properties.
Note: You can have the USB connection box checked in addition to the serial cable box without affecting processing. However,
you should use RS-232 or USB.
HomeBase /Host Port
(DCE)
IBM AT DB9
(DTE)
IBM XT DB25
(DTE)
Modem DB25
(DCE)
Pin / Input Signal
2 / (RD) 2 3 2
3 / (TD) 3 2 3
5 / (SG) 5 7 7
4 / (DTR) 4 20 6
6 / (DSR) 6 6 20
7 / (RTS) 7 4 5
8 / (CTS) 8 5 4