Virtual Tunnel
Protocol Manual - CIU Emulation Part No.: 4417589_Rev13
2- 2 CIU 888
2.1 Downlink CIU
The principle of a downlink CIU with gauges is for a virtual tunnel similar
to that for CIU Emulation. The main difference concerns addressing, as
described in section 2.2. See section 1.1 for more information about
downlink CIU.
2.2 Addressing
Addressing for virtual tunnel is similar to addressing for CIU Emulation.
The main difference is, that with addressing for virtual tunnel only the
address of the gauge is needed, whereas with addressing for
CIU Emulation both the address of the CIU 888 and the address of the
gauge are needed. With addressing for virtual tunnel, the CIU address
is not needed, because an IP address is used to address the CIU 888.
See section 1.3 for more information about addressing.
As with CIU Emulation, cache mode is also supported. Service tools
(TCP/IP clients) connected to the Service port of the CIU 888 can
retrieve cached data if they are connected through port 55598, or non
cached data through port 55597.
2.3 Virtual tunnel in a redundant setup
If two CIU 888s are configured as a redundant pair and virtual tunnel is
enabled, requests for connection sent to the service port of the
secondary CIU 888 will be rejected.
NOTE: Refer to the Configuration Manual CIU 888 (Part No. 4417584) for more
information about redundancy.
2.4 GPU protocol on TCP/IP
The GPU protocol on TCP/IP is similar to the GPU protocol on serial
(RS-232/RS-485). The main difference concerns addressing, as
described in section 2.2. See APPENDIX A for more information about
the GPU protocol.
2.5 Configuration through Service port
To setup a virtual tunnel, a PC/laptop with Honeywell’s Engauge
installed is needed. Engauge is a software tool designed to configure,
commission and adjust Honeywell’s gauging instruments. In addition, a
Cat. 5 Ethernet cable is required.
NOTE: Refer to the Installation and Operation Manual Engauge 2.6 - Professional
(Part No.: 4417485) for more information about Engauge.
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