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RS-232 Cables
Connect the HomeBase to the host workstation or other device by plugging an RS-232 serial cable into the
page 10-3) 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 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
HomeBase /Host Port (DCE)
Pin / Input Signal
2 / (RD)
3 / (TD)
5 / (SG)
4 / (DTR)
6 / (DSR)
7 / (RTS)
8 / (CTS)
Note: The HomeBase cannot be daisy-chained.
10 - 8
IBM AT DB9 (DTE)
IBM XT DB25 (DTE)
2
3
5
4
6
7
8
Rev (b)
5/15/2007
RS-232 Port
Modem DB25 (DCE)
3
2
2
3
7
7
20
6
6
20
4
5
5
4
Dolphin® 7850 Series User's
Guide–Preliminary
(see
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