Watlow NAFEM Gateway - Manual (Page 49)

49
Specifications
Operation
Notification Handling per NAFEM PROTOCOL MANUAL for Alarm and Notification handling.
The Alarm Module performs the checking of parameter status and trigger notification events within 500
milliseconds.
Gateway accommodates a reading of all 64 remote device attributes from a single device in one-
second and all connected devices' attributes in four seconds.
SNMPv1Agent performs the interaction between the Gateway and the remote networked User's
Application running an SNMP manager. The SNMP v1 Agent will respond to the remote manager (User
application initiated) requests at a rate of 40 Hz - Reference RFC 1157.
TFTP Client - Reference RFC 1350.
Web Server performs the interaction between the Gateway and the remote networked User's
Browser. The Web Server will serve web pages to the remote browser (User initiated) at a rate of one
page every five seconds.
Poll Engine
The Poll Engine initiates communications between the Gateway and the remote devices. Individual SCAN
RATES are user programmable in one-second intervals. The Poll Engine performs these polls in an
asynchronous manner thereby eliminating the remote devices response time from time considerations of
internal events. The poll rate of the Poll Engine is 10 Hz assuming a 20 Hz remote device response time,
19200-baud rate, and no retry requirement.
Real-time Clock
The on board Real Time Clock circuit provides the Gateway with time reference and is read for
Gateway time clock updates on a one-minute interval. Accuracy is ± 4 minutes per year and provides
timing accuracy of ± 0.5% over a range of 0 to 999 seconds. Battery Backup provides a minimum of 6
years service.
Serial Communications
Complies with EIA-485 standards - supports 19200 and 9600-baud rates.
Connectors
RJ45 for Ethernet connection interface per IEEE 802.3
Coaxial power connector with positive center post
DB9 connector for Serial connection
Power
Input Voltage Ratings
5VDC for Wall Transformer interface with coaxial plug
UL
⎛ approved, Class II power supply required
Input Power Ratings 10 Watts Maximum
Real-time Clock backed by 3v-lithium battery – RAYOVAC BR1225
Environmental Conditions
Operating temperature range: 0 to 60
°C
Storage temperature range: -40 to 70
°C
Operating and storage humidity: 0 to 90% non-condensing