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
W
hi
te
Wh
ite
B
lac
k
B
lac
k
Y
e
llo
w
Y
el
lo
w
B
lu
e
B
lu
e
Next Meter
1:
2:
3: B
4: A
5: A1
6: B1
7: VCD
8: Gnd
Gnd
+V
PC
Standard 9-25 Way Lead
Summary of Contents for A1120
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Page 3: ...A1120 40 Programmable Electronic Polyphase Meter Chapter 1 Introduction M181 001 1B 5 2009 ...
Page 4: ...Minor Change Record Date Modification 7 5 2009 Format change ...
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Page 53: ...Operating Maintenance Instructions 45 Figure 4 Load Curves ...
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