Temperature Controller - Staveb AG

Preparations 2-13Figure 2.12 Communication Unit Wiring DiagramPC with RS-232 toRS-485 convertersuch as 900-CONV• The RS-485 connection can be either one-to-one to one-to-N. Up to 32units including the host computer can be connected in one-to-Nsystems. Use shielded, twisted pair cable (AWG 24…14) and keep thetotal cable length to 500 m.• Specify both ends of the transmission path including the PC as the endnode (that is, connect terminating resistors to both ends). Themaximum terminal resistance is 54 Ω (see Figures 2.11 and 2.12).• The first and last device in the RS-485 link must be terminated with a120 Ω 1/2 W resistor.Figure 2.13-+Shielded cable900-TC32 (No.1)900-TC32 (No. 31)FG RS-485 RS-485No Abbr.No Abbr.AB : ⎡0⎦5 B (+)5 B(+)Terminator (120 Ω, 1/2 W)AWG24 min.Conductor area cross-section0.08042mm 2 min.• To use a PC on an RS-485 link/network connection, a Bulletin900-CONV RS-232-to-RS-485 or equivalent converter is required.Figure 2.14900-TC8900-TC8PCRS-232RS-485900-CONVNote: The PC must have 900Builder software installed to configure/monitorthe Bulletin 900-TC32.Publication 900-UM003C-EN-E - January 2004