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Dolphin® 7850 Mobile Computer
User’s Guide
Rev C
4/30/2008
9 - 9
RS-232 Cables
Connect the HomeBase device to the host workstation or other device by plugging an RS-232 serial cable
into the RS-232 Port (see page 9-3) on the back panel. The wiring of your cable depends on whether the
other device is set up as a Data Communication Equipment (DCE) or Data Terminal Equipment (DTE)
device.
The HomeBase device is configured as a DCE device. To communicate with another 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 computer, 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: HomeBase devices
cannot
be daisy-chained.
Host Port
(DCE)
IBM AT DB9
(DTE)
IBM XT DB25
(DTE)
Modem DB25
(DCE)
Pin / Input Signal
2 / (RD) 23 2
3 / (TD) 32 3
5 / (SG) 57 7
4 / (DTR) 420 6
6 / (DSR) 6620
7 / (RTS) 74 5
8 / (CTS) 85 4