RTM for the CONV-TTL-RS485 board in D-Sub9 format
A new RTM design for the CONV-TTL-RS485 has been proposed to fullfill a number of user requirements:
-
User requirements (CERN specific):
- Most of the legacy boards to be replaced by the new generation repeaters, use a D-Sub 9 connector for the RS485/RS422 interface. The proposed LEMO 0S RTM is therfore not a drop-in replacement.
- The use of the RS485 protocole is mainly required in fanout topologies, where one signal must be propagated to multiple locations. The 6 channels on the LEMO 0S RTM, although offer 3 outputs each, still need to be manually daisy-chained in order to offer a maximum number of output signals.
-
Design specification
- RTM with D-Sub 9 interface for I/O.
- The RTM repeats on 2 channels (channel 1 and channel 2) of the 6 available from the CONV-TTL-RS485 board.
- Each of the two channels has one input signal and 5 output ports.
- The RTM is designed in the piggyback format, similar to the
LEMO 0S RTM (see
below), in order to be mounted on the same RTM
motherboard
used for CONV-TTL-RS485 and CONV-TTL-BLO RTMs.
LEMO 0S RTM (NO LONGER SUPPORTED)
An RTM for the CONV-TTL-RS485 board has already been designed and
tested. It is a 6 channel RTM with each channel capable of receiving one
input in RS485 and repeating it on 3 outputs.
This RTM uses LEMO 0S connectors with 2 pins. This RTM is now no longer
suppoted, and only a few prototypes exist of this
design
_Side-by-side are the current CONV-TTL-RS485 RTM with LEMO 0S
interface
and a mock-up of the 2-channel version with D-Sub9 interface_
Hardware versions
Rear transition module (Motherboard + piggyback) : EDA-02452
EDA-02452-V3-1 | No longer supported Third version, moves the 100-pin connector to the inside of the board, to avoid bending the panel |
---|---|
EDA-02452-V3-3 | Closed First version with D-Sub9 piggyback. Layout of connectors on piggyback incorrect. See issue #1751 |
EDA-02452-V3-4 | Closed Uses same RTM motherboard but with new piggy back EDA-03712-V2-0 for DB9 connector compatibility |
EDA-02452-V3-5 | Modifies RTM motherboard strip male connector to improve mechanics of front panel. Uses piggy back EDA-03712-V2-1 |
Rear transition module piggyback in D-Sub9 format: EDA-03712
Mounted on EDA-02452, to give EDA-02452-V3-3/V3.4
Version | Description |
---|---|
EDA-03712-V1-0 | Closed First version of a 2-channel 1 i/p, 5 o/p RTM piggyback with D-Sub9 connectors |
EDA-03712-V2-0 | Closed Corrects issue #1751 found on version 1. Uses different connectors with built-in screwlocks |
EDA-03712-V2-1 | Uses shorter LEDs and standoffs to give better contact for DB9 cables |
Rear transition module piggyback in LEMO 0S format: EDA-02494: No longer supported
Mounted on EDA-02452, to give EDA-02452-V3-1.
Version | Description |
---|---|
EDA-02494-V1-0 | Closed First version |
EDA-02494-V2-0 | No longer supported Second version, connects the RTMP detection lines to the 100-pin connector and the N lines on the Lemo 0S connector |
Project status
Date | Event |
---|---|
30-06-2017 | Launch design of conv-ttl-rs485-compatible D-Sub9 RTM |
27-09-2017 | Held hardware review for conv-ttl-rs485 v4 motherboard and conv-ttl-rs485 RTM DB9-to-DB9 RTM |
13-11-2017 | Held layout review for conv-ttl-rs485 v4 motherboard and conv-ttl-rs485 RTM DB9-to-DB9 RTM |
06-02-2018 | 5 prototypes for the RTM in D-SUB 9 received |
28-02-2018 | v1.0 obsolete. Launch layout modifications for v2 of DB9 RTM |
28-02-2018 | v2.0 Received |
19-03-2018 | v2.1 designed with modified mechanics for better connectivity |
05-06-2018 | Order for 200 modules delivered normally during Q4 of 2018 |
Denia Bouhired, July 10th 2018