DocuMatch
TM
Integrated Mail System
DocuMatch Application Notes
85
Connecting DocuMatch to a Serial Port
Instead of the standard parallel port, it is possible to use a
serial connection to a DocuMatch. A serial connection will
operate over a distance of up to about 50 feet of cable,
versus a maximum of 15 feet for a parallel connection.
Serial connections may not be supported on future ver-
sions of the DocuMatch.
However, you should be aware that the serial connection
will generally be significantly slower than a parallel connec-
tion. The maximum serial port speed is 38,400 bits per
second or about 3800 bytes per second. The parallel port
is about 10 times faster. If your documents contain any
significant graphics content, the DocuMatch system will
not operate at full speed on a serial port connection.
If speed is an issue and/or you need a longer cable than
that supported by the serial connection, you can use a
network connection or a parallel port extender. The Model
PI-32A-R3 PC Parallel Distance Extender, available from
Black Box at (724) 746-5500, is a good choice.
Here are the cabling and setup requirements to drive the
DocuMatch with a PC/AT-type (9 pin) serial port.
The cable required is a standard PC Serial printer cable.
Note that this is different from a parallel cable or a modem
cable. It is also not the same as a modem cable plus a null
modem. You can order these cables from the Black Box
catalog at (724) 746-5500. Order EVMBPC-0025 (25 feet)
or EVMBPC-0050 (50 feet).
The pinouts required are shown in the table on the next
page.
Cable
Requirements
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