12. Legacy Mode
12.1. Introduction
The Legacy Mode provides a means to control an ECH5xA, ECH4xA, ECH242, or ECH244 crate directly by CAN bus, e.g. connected
to a PC with a PCAN-USB adapter and running iseg or customer specific software.
This mode allows to use these modern crates as direct replacement for ECH238 and ECH224 crates.
When the Legacy Mode is activated, no further communication from the services (isegHAL, iCSservice, SNMP, EPICS) to the
modules is possible. However, the crate controller itself can still be controlled by these services (e.g. monitoring or turning the
backplane on or off). The Crate Status bit High Voltage On is always zero, even if high voltage is turned on
The following limitations currently apply:
•
Legacy Mode is only implemented into CC24 Master controllers
•
Only one crate can be connected to a CAN line
•
Remote controlling and monitoring the crate controller by CAN bus is not possible
•
Monitoring high voltage on and the module temperatures is no longer possible. Therefore the fans go to maximum
speed
•
The backplane of modern crates has non-linear addressing, so the modules have different addresses compared to
ECH238. The mapping is available in the following table
Slot
Address Single Module
Address Double Module
A Board
B Board
0
0
0
1
1
2
4
5
2
3
6
7
3
12
8
9
4
13
10
11
5
14
14
15
6
16
16
17
7
18
20
21
8
19
22
23
9
28
24
25
Crate Controller CC24/CC23 | Last change on: 14.04.2020 |
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