Document 15094 Rev C 11/20/95 15094:C
Page 15
SIB-NET
P5
1
20 ohms,
1/4 watt
CPU-2020/CPU-2
EIA-485 circuit characteristic impedance of twisted-pair wiring should be approximately 120 ohms.
Figure 1-8: EIA-485 to SIB-NET Connections
4-
3-
2+
1+
7
6
5
4
3
2
1
TB2
TB1
4-
3-
2+
1+
7
6
5
4
3
2
1
TB2
TB1
Refer to Appendix A for EIA-485 circuit ratings and limitations.
NOTE: If the SIB-NET is not the first device on the EIA-485 circuit, set SW1 on the SIB-NET to the ''out''
position.
The EIA-485 Reference (P5-1) for the SIB-NET must be connected to any ACS device which is not within the
same cabinet or is not powered by the SIB-NET AM2020/AFP1010 power supply. Connect P5-1 of the SIB-
NET to:
• ACM-16AT at TB1-4
• LDM-32 at TB1-4
• NIB-96/AMG-1 power supply (MPS-24A) at TB2-2
• SCS-8/L at TB1-4
• LCD-80 at P1-4
• RPT-485W Ref. A at TB1-5
• RPT-485W Ref.B at TB2-5
• RPT-485WF Ref. A at TB1-5
EIA-485 Reference
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