Connecting The Omni 288S; Turning On The Omni 288P Or Omni 288S - ZyXEL Communications 2864 Series User Manual

If the modem's parallel port is always connected to a laser printer for fax printing, a
computer/terminal can connect to the modem's AUX RS232 serial port for issuing
AT commands and reception of responses. This is good for configuration and mon-
itoring operation without disconnecting the laser printer. This AUX RS232 serial
port is intended only for AT command and response's transmission; it is not intend-
ed for DTE data transmission. Auto speed detection is not supported on this AUX
RS232 port. Only the speeds 38400 bps and 19200 bps are supported on the AUX
serial port, 38400 bps being the default speed. The asynchronous character format
accepted on the AUX RS232 port is 8N1 (8 data bits, no parity, one stop bit).
A RJ45 to DB25F connector adapter is needed to convert the RJ45 AUX RS232
port to a normal DCE DB25 female serial port connector. The following table lists
the conversion connections:
Signal Name
TXD
RXD
RTS
CTS
GND
DSR, CD, DTR
Phone Line Connection
Use the telephone cable supplied to connect the modem's LINE jack to the tele-
phone line wall jack. You can also connect a telephone set to the modem's PHONE
jack in case you need the telephone for voice communication. A telephone set is not
needed for the modem's data, fax, and voice mail communication. The telephone set
may also be used to record or to playback voice messages.

Connecting the Omni 288S

Please refer to the above description for connecting the Omni 288P. The descriptions for
the power and phone line connection also apply to the Omni 288S. The descriptions for
connection to a computer or a printer through the parallel port do not apply, because the
Omni 288S has a serial port for connection to a computer/terminal's serial port only.
There is no possibility to connect to a printer by parallel port.

Turning on the Omni 288P or Omni 288S

Turn on the power switch on the modem to turn on the modem. The modem will
do a self-test each time it is turned on. The SQ LED will flash if the power-on self-
test fails. For a more detailed description of the diagnostic tests, please refer to
chapter 18 (DIAGNOSTICS).
Pin No. on DB25F
2
3
4
5
7
6, 8, 20 tied together
3–13
Pin No. on AUX RJ45
1
8
2
7
3 and 6
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