Owner manual

Telebyte 209 Short Haul Modem
2305 Bering Drive 01850-001 Rev. G
San Jose, CA 95131 USA
[phone] [phone] FAX [phone]
Web: www.kerisys.com E-mail: [e-mail] Page 3 of 5
Short Haul ModemQuick Start Guide
2.3 Connecting to the Host Computer - DB-9 to DB-9
If the host computer's COM port uses a male DB-9 connector the short haul modem can be plugged
directly to the COM port (see Figure 2). Set the switch on the short haul modem to the DCE
position by gently turning the switch completely counter-clockwise.
Figure 3: Host Computer to Short Haul Modem Connection
2.4 Connecting to the Host Computer - DB-9 to DB-25
If the host computer's COM port uses a DB-25 connector a DB-25 to DB-9 reduction plug must be
used.
2.4.1 Using a "Straight-Through" Reduction Plug
If the reduction plug uses straight-through wiring (pins 2 and 3 on the 25 pin side go straight
through to pins 2 and 3 on the 9 pin side) make the connection as shown in Figure 3. Set the switch
on the modem to the DTE position by gently turning the switch completely clockwise.
Figure 4: Host Computer to Short Haul Modem Connection Straight–Through Reduction
Plug