Modem
transmission
© Diebold Election Systems, Inc. 2002 AccuVote-OS Hardware Guide
33
•
Use one
stop bit
at the end of each character, signifying the end of the bit string
representing the character (N-8-1)
Figure 8-1: AccuVote-OS Modems
8.5. Setting Up Host Computer Modems
Each telephone line used to perform modem transmission at election central must be connected
to a modem. A modem can transmit or receive data at speeds between 110 bps (bits per
second) and 56 kilobps. The speed used will depend on either the speed of the incoming
transmission or the capacity of the receiving device. Each modem should:
•
Have factory settings changed to E0, Q1, &C1 and S0=1
•
Be connected to a power supply with a transformer and cable
•
Be connected from the Line jack to a wall telephone jack or the PBX using an RJ -11
cable
•
Be labeled with the port and telephone numbers
•
Be attached to a host computer serial port by means of an RS-232C cable.
The front and backs of the typical modem used are displayed in Figure 9-2 and Figure 9-3.
