Metasys N2, Technical Manual

Page: 13 / 67

N2 Dialer Module—N2 Dialer Module (NDM) 13
The Hayes Optima 96 and Optima 144, along with Practical Peripherals 144 V.32bis
MiniTower II modems, have been qualified for use with the NDM. These modems use
the default setup strings as defined in HVAC PRO for Windows.
The U.S. Robotics Sportster 14,400 is also qualified for use, but requires the special
modem setup noted below. Refer to the N2 Dial Application document in the HVAC PRO
for Windows User’s Manual, FAN 637.5, on how to program setup strings. Other brands
of Hayes compatible modems may experience problems if they are not fully Hayes
compatible.
The purpose of modem setup strings is to meet individual modem requirements and adapt
to various phone line conditions.
The following strings are the default modem setup strings for the NDM which are sent to
the modem upon power-up.
Note:
0 = the number zero
AT &F
AT E0 L0 N0 Q1 &C1 &D3 &Q0 &S0 S0=1 S8 = 4 S11= 50 S37=9
The string definition is:
&F
- recall factory settings
E0 - disable character echo
*L0 - low speaker volume
N0 - Lock in at speed specified in S37
Q1 - disable result codes
&C1 - DCD tracks the carrier
&D3 - DTR signals a hard-reset of modem
&S0 - DSR is always active
&Q0 = - force asynchronous communications. Include in the local NDM setup
strings; exclude from the remote NDM setup strings.
*S0=1 - answer after 1 ring
*S8 =4 - comma duration set at 4 seconds
*S11=50
- used to increase dialing speed (tone only)
S37 = 9 - connect only at 9600 baud
* Only these parameters may be changed from default values. All other listed parameters
require default values for proper operation of the NDM.
Supported
Modems
Modem Setup
Modem Default
Setup Strings