Operations and Maintenance Manual
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JANUS
®
Multi-Protocol Reader 2.4 Maintenance Instructions
Confidential UM 360467-110 Revision: B Page 174 of 247
© Kapsch TrafficCom Canada Inc. 2021
All information contained herein is proprietary to, and may only be used with express, written permission from, Kapsch TrafficCom Canada Inc.
FILE: UM 360467-110 REV B3 MPR 2.4 CLEAN.DOCX 03/02/2021 1:01
Kapsch TrafficCom
Selecting the correct communication method between reader
The communication method determines how Readers communicate with each other to share information for
determining lane assignments. This is important for situations similar to that shown in Figure 5-14, where, to
assign the OBU to a lane, Reader 1 and Reader 2 need to share handshaking information. The available
communciation methods are:
Legacy CRA: there is no physical link between the Readers, such as an IR Network. Instead, the first Reader to
contact an OBU, programs the OBU. All other Readers that subsequently contact the OBU recognize it was
recently programmed and ignore the OBU.
Note: CRA only applies to the TDM protocol, with read/write enabled.
Note: The TDM Reader ID must be different for all adjacent readers. Shown on Tag Protocols page.
Note: The TDM Plaza ID must be the same for all adjacent readers. Shown on Tag Protocols page.
Note: All adjacent readers must be time synchronized.
Note: The Transponder Timeout, set in the Group panel on the Channels page, must be greater than the
time difference between all Reader clocks in the network.
Ethernet: An IR Ethernet network connects the Readers together and handshaking information is shared
between Readers. The Readers assign the OBU to one channel and all other transaction reports from other
Readers are suppressed.
Note: The same Legacy CRA constraints listed above also apply to Ethernet voting, as this is used as a
fallback when a IR link loss Is detected.
Note: Multiple (voting) group IDs are not supported across multiple Readers.
Configuring Voting over an Inter-Reader (IR) network
This procedure describes the network settings for Inter-Reader lane assignment.
Prerequisites: Accessing the Reader web interface, page 42.
1. From the Lane Assignment page, in the Inter-Reader panel, click on the Ethernet option
2. Review the Inter-Reader alias setting on the Primary CTM. The Inter-Reader alias must be unique for
each adjacent reader at a plaza but the same for both Primary and Seconder CTM. Note that with
Configuration Alignment enabled, this setting is automatically replicated on the Secondary side. For the
first reader you configure at a plaza, you could keep the default alias of 192.168.0.151. The second reader
you configure could be set to 192.168.0.152, for example. Note all Inter-Reader addresses must be on a
different subnet than the Ethernet 1 interface.
3. Review the Ethernet 2 IP address setting. It must be on the same subnet as the Inter-Reader alias
configured above. For the first reader you configure at a plaza you can keep the default Ethernet 2 IP
address of 192.168.0.50 on the Primary side. On the Secondary side, you can keep the default Ethernet
2 IP address of 192.168.0.51. Additional reader you configure must have a unique Ethernet 2 IP address
setting across all CTMS. For example the next reader you configure could have Ethernet 2 IP address of
192.168.0.52 on the Primary side and 192.168.0.53 on the Secondary side.