GEM80-400
5. Central Highway & Fast I/O Modules
Issue 3 04/99
ALSPA GEM
80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Page 5-15
5.11.2. Hardware
The GEMLAN-D Module is a double width module that fits into a GEM
80-400
Enhanced Controller subrack. Network connections to the module are made
via the connectors on the front panel. GEM
80 system connection is made via
connectors at the rear of the module. The front panel of the GEMLAN-D Module
provides connection points for ISO 8802-3 10base5 (ThickWire) and 10base2
(ThinWire) networks.
5.11.3. Installation
The GEMLAN-D Module connects to the Central Highway of the GEM
80-400
Enhanced Controller. The backplane of the controller may be mechanically
coded so that it can locate only certain modules in specific Central Highway
slots; this function is not performed by the factory but must, if required, be
carried out by the user. For more information regarding mechanically coding,
please contact Customer Support, Cegelec Industrial Controls Ltd.
5.11.4. Operation
Note...
It must be noted that, unlike most other GEM
80 equipment, the operating
temperature of GEMLAN-D is 0 to 50
°
C, and not 0 to 60
°
C. Therefore, a GEM
80-
400 Enhanced system incorporating GEMLAN-D must be operated within the
temperature range 0 to 50
°
C.
The function of the GEMLAN-D Module is to allow GEM
80 systems and DECnet
devices to communicate on a DECnet network.
The GEM
80 user interface to GEMLAN-D consists of five GEM
80 Special
Functions:
-
LOPEN
-
LCLOSE
-
LREAD
-
LWRITE
-
LSTATUS
These GEM
80 Special Functions are used to open and close channels between
a client and server, read data from a remote machine on the network, write
data to a remote machine on the network and to query the current state of a
specific local channel. GEMLAN-D also provides an interface that allows a
DECnet device user access to GEM
80 control/programming capabilities.
5.11.5. Connections
The attachment of a GEMLAN-D Module to an ETHERNET network requires some
user supplied equipment and cables. Any necessary items should be obtained
from third party vendors specialising in ETHERNET equipment.
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