10 Ethernet module User’s Manual
Chapter 1 Ethernet Module (EN311) Overview
1
1.5 EN311 Specifications
Table 1-2 lists the EN311 specifications. The general specifications of the EN311
conform to those of the S controller.
Table 1-2 Functional Specifications
Item Specification
Module type EN311
Transmission specifications 10BASE5(Ethernet) 10BASE2(Cheapernet)
Media access method CSMA/CD
Modulation Baseband
Transmission topology Bus type
Transmission speed 10 Mbps
Maximum distance between
nodes
2500 m 925 m
Maximum segment length 500 m 185 m
Maximum number of MAUs 100 units/segment(*) 30 units/segment
Minimum node separation 2.5 m 0.5 m
Connector 15-pin D-SUB (female) with
locking fitting
BNC connector
Connecting cable AUI cable conforming to the
ISO8802-3 standard
AUI cable: up to 50 meters in
length
Coaxial cable (RG-58/U: with
BNC connectors) using
T-adapter
Transmission services 1. T series computer link protocol (slave station)
2. T series/PC link protocol (master station/slave station)
3. Socket interface (8 sockets)
RAS functions 1. Self-diagnostics at power on
ROM, RAM, LAN controller,
S controller interface memory, MAC address
2. Test functions accessible from user programs
• Remote station verification request
3. Data provided by RAS data readout
• Event trace
• LAN controller (network) information
• Protocol state
4. Time/date setup function
5. Socket information in the S controller interface memory
Current drain [A] 0.7A (5V DC), 0.5A (12 VDC)
Outer dimensions [mm] 33.0 (W) × 250 (H) × 110 (D)
Weight [grams] 480
Board specifications One slot (slot width)
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