Appendix B - Rs232 Multi-Drop Mode; B1 Rs232 Multi - Drop Installation Procedure - Elster A1140 User Manual

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A1120/40 - Electronic Polyphase Meter

APPENDIX B - RS232 Multi-drop Mode

A1120/40 meters allow up to 12 meters to be connected in RS232 multi-drop configuration. Two-
way RJ11 adaptors will be required to link each meter in the chain.
B1 RS232 Multi-drop Installation Procedure
The connection diagram for RS232 multi-drop mode is shown below
1. Observe all Safety Warnings, Warnings, Precautions for handling electrostatic
discharge sensitive devices and EMC Guidelines in Section 2
2. Remove the terminal cover from the meters. If the terminal cover plate is not in place, switch
off all supplies to the meter.
3. Connect a two-way RJ11 adaptor to the RJ11 port of the first meter in the multi-drop chain
4. Connect an RS232 cable from the PC to the first port of the RJ11 as shown below
5. Connect a Flat Pin Cable to the second port of the RJ11 adaptor
6. Replace the terminal cover and fit appropriate seals
7. Connect a two-way RJ11 adaptor to the RJ11 port of the second meter in the multi-drop chain
8. Connect the flat pin cable from the first meter to the RJ11 adaptor of the second meter in the
multi-drop chain
9. Connect a Flat Pin Cable to the second port of the RJ11 adaptor
10. Replace the terminal cover and fit appropriate seals
11. Continue as steps 7 to 10 to the next meter
12. When all multi-drop connections are made and all terminal covers are in place, switch on the
supplies
(2) Tx
(3) Rx
From PC
(4)
(5)
6 5 4 3 2 1
© Elster Metering Limited - M181 001 2G - 5/2010
Rx (2)
R 11 Adaptor J
Tx (3)
No Connection (4)
Zero Volts (5)
RJ11 Connector
Flat Pin Cable
R 11 Adaptor J
Next Meter