Hand Held Products 9550 - Manual (Page 213)

Dolphin® 9500/9550 Mobile Computer User’s Guide 11 - 7
Setting the Mobile Base Up for Communications
The Mobile Base RS-232 interface allows the Dolphin terminal to communicate to a personal computer, modem, or any standard
RS-232 device using a standard serial cable and communications software.
Connecting the Cables
Connect the Mobile Base to the host computer or other device by plugging an RS-232 serial cable into the RS-232
Communications Port on the bottom of the Mobile Base. Plug the other end of the RS-232 serial cable into the correct port on
the host RS-232 device.
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 Mobile Base Communication Port is configured as a DCE device. To communicate with a DTE device such as a computer,
use a standard (or straight-through) RS-232 cable. 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.
RS-232 Pin Configuration
Refer to this table if you want to make your own cables. To do so, you must determine if your host RS-232 device is
• 9-pin or 25-pin and
• configured as a DCE or DTE device.
Mobile Base /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