CTI Products NCB/EM with External PSTN Modem - Manual (Page 10)

CTI Products, Inc. NCB-EM User Guide
1. Introduction 4
NCB units are available with an option for LonWorks network transceiver type. The ordering code on the rear
of the NCB lists the installed options. This ordering code is of the form: NCB/EM-Txxx-xx, where ‘T’
indicates the transceiver type.
The following LonWorks network transceiver options are available:
A = FTT-10A K = SMX RS485
B = TPT/XF-78 M = SMX PL22
C = TPT/XF-1250 X = None (SMX ready)
Wide Area Network Ports
Normally Point-to-Point connections are made between pairs of NCB’s. A more
fault-tolerant network may be implemented by using the Ring Mode connection
topology.
External Serial Ports
“PORT 1” and “PORT 2” are standard asynchronous serial ports with individually configurable baud rates from
1200 to 115200 bps. An external modem can be connected to each port. “PORT 1” and “PORT 2” pinouts
allow direct connection to a modem via a standard 9 pin to 25 pin cable.
Data Flow
There are three sources of message packets within the NCB module. The first source is the LonWorks
NETWORK connector on the front of the unit. The second is the “PORT” connectors on the rear of the unit.
The third source is the Control Neuron

Processor. Message packets originating from any of these sources are
sent to the other two. This message packet flow is shown in the block diagram of Figure 2.
LONWORKS
NETWORK
Side
A
ROUTER
LONWORKS
TRANSCEIVER
“DC IN”
Connector
“NETWORK”
Connector
“PORT 1”
Connector
“PORT 2”
Connector
To Modem 1
To Modem 2
Side
B
SMX
TRANSCEIVER
POWER
SUPPLY
CONTROL
NEURO N
PROCESSOR
Figure 2 NCB Network Combiner Block Diagram
 The “NETWORK” connector attaches to the local L
ON W ORKS network using a compatible transceiver
internal to the NCB module and is associated with Side B of the internal router.
 The “PORT” connector attaches to the modem as the link to the NCB unit at the other network site and is
associated with Side A of the internal router.

The Control Neuron

Processor allows network management messages to be sent to the NCB module for
connection control and status monitoring and is associated with Side A of the internal router.
See Appendix H
for Ring Mode
details.