Telos Zephyr Xstream - Manual (Page 40)

USER’S MANUAL
Section 3: GUIDED TOUR of the HARDWARE 28
Z ZEPHYR CLASSIC VS XSTREAM COMPARISON!
NOTE: The RS-232 connectors on the newer Telos gear, such as the Zephyr Xstream, are
wired to look like a modem (i.e. DCE), rather than a computer. Therefore, a standard
“straight through” cable can be used to connect the Xstream to your computer.
You told us that you were much more likely to connect your equipment to a computer than to
a modem, so we responded with this change. We regret any confusion this might cause.
If you need to connect your Xstream to a modem, use a "null modem" adapter such as Radio
Shack #26-1496 (25 pin to 25 pin) or #26-264 (9 pin to 9 pin).
PIN FUNCTION
1* DCD (Xstream to Computer)
2 RD (Xstream to Computer)
3 TD (Computer to Xstream)
5 Ground
6* DSR (Xstream to Computer)
8* CTS (Xstream to Computer)
* These handshake signals are present (i.e.
permanently asserted) on motherboard versions
"G" and later
Using a 9 pin female D-Sub connector, this is an RS-232 serial port using the standard 9-pin format,
configured as if it were a modem. Zephyr Xstream ignores any incoming handshake signals.
A computer plugged into this port can control the system, and can access a number of special
diagnostic modes, as described in Section 12 (System Functions & Remote Control). It is also
possible to connect to the Zephyr Xstream’s command line using TCP/IP (see below).
When used for local control this function is always available. For more on the local command set
see Section 12.
This port can also be placed in a “transparent mode” to allow communication with another
Zephyr (Layer‐3 only) or Zephyr Xstream (Layer‐3 & AAC only). Note single‐direction
communication is possible if the correct coding mode is only used in one direction.
The following tables show the recommended cable configuration for connecting the Telos
Zephyr Xstream to 9‐pin and 25‐pin DTE (computer) serial ports.