Elster A1140 - Appendix C - Rs485 Multi-Drop Mode

Operating & Maintenance Instructions 59
APPENDIX C - RS485 Multi-drop Mode
A1120/40 meters allow up to 12 meters to be connected in RS485 multi-drop configuration. Two-
way RJ11 adaptors will be required to link each meter in the chain.
Amplicon
Amplicon Amplicon
8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
25-way D type
25-way D type
25-way D type
+VDC 7 4 2 3
+VDC 7 4 2 3
6 5 4 3 2 1
6 5 4 3 2 1
RJ11
RJ11
White
White
Black
Black
Yellow
Yellow
Blue
Blue
Next Meter
1:
2:
3: B
4: A
5: A1
6: B1
7: VCD
8: Gnd
Gnd
+V
PC
Standard 9-25 Way Lead