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N2 Dialer Module—N2 Dialer Module (NDM) 33
Commissioning the N2 Dialer Module begins after the unit is mounted and wired. A
laptop PC with HVAC PRO for Windows is recommended to perform a complete startup
procedure.
1.
Define hardware and software NDM points in facility management system data base.
2.
Obtain modem.
3.
Complete installation. See Installation Procedures in this document.
4.
Set EOL, N2 Address.
5.
Power up or cycle power for N2 address to take effect. Observe LEDs for proper
startup sequence and any startup diagnostic errors.
6.
Configure in HVAC PRO for Windows Release 5.10 or later.
Note:
Passive printer applications require HVAC PRO for Windows
Release 6.00 or later. See Passive Printer Application, earlier in this
document, for information.
7.
Download NDM.
When power is first applied to the NDM, it begins Normal Startup mode. This mode is
entered any time the N2 address DIP switch is not set to zero. In Normal Startup mode
the NDM tests for Internal and External RAM, ROM, EEPROM, and UART Internal
Loopback. Each test is performed conditionally, and succeeding tests are initiated if the
preceding test passed. If a test fails, the LEDs on the NDM hold for two seconds to
identify the test that has failed and then the NDM resets, repeating the sequence.
Table 7: Startup LED Diagnostics
Diagnostic
LED Activity
Duration
Startup
Both on solid
2 seconds
Internal RAM
Both off
1 second
External RAM
Receive-on, Transmit-off
1 second
ROM
Receive-off, Transmit-on
1 second
EEPROM
Both on
1 second
UART Test
Both off
1 second
Normal Operation
Both over to N2 Control
Until reset
Once normal operation begins, the NDM checks the DSR line on the RS-232 port for
presence of the modem. If the modem is present, the NDM sends the modem setup
strings to the modem. Furthermore, setup strings are sent to the modem after the modem
resets, cycles power, or is replaced.
In the case of a remote NDM, the NDM polls all configured addresses on its remote N2
trunk, building a table of online and offline devices. Once this information is collected,
the NDM polls the devices for alarms and online/offline transitions.
The NDM comes from the factory in an unconfigured state. This means the NDM can be
downloaded via the N2 Bus connections using a MM-CVT101-0 and HVAC PRO for
Windows Release 5.10 or later.
To download the NDMs, perform the following steps:
1.
Set the N2 Bus address on the NDM. Valid addresses are
between 1-255.
2.
Apply power to the NDM with the modem either disconnected or the power off. If
the NDM is already powered up, simply disconnect the modem or turn the power
off. This causes the NDM to reset. Wait approximately 30 seconds until the NDM
goes through its diagnostic sequence. When the sequence is complete, both the
transmit and receive LEDs are off.
Commissioning
Procedures
Startup
Downloading
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