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Table of Contents
Related Manuals for Rextron LCS485
Summary of Contents for Rextron LCS485
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Page 2: Table Of Contents
Table of Content Introduction Overview Configurations Installation Power supply Connector Connection Point-to-Point Multipoint Simplex/Transmit, Receive Only Monitor Diagnosis Appendix Please read this manual thoroughly and follow the Installation procedures to prevent any damage to the unit or any connecting device. ＊... -
Page 3: Introduction
With +/-15kV ESD protection, the LCS485 is ideal for long distance differential signal transmission. Depending on the number of signal wires, it can operate under Four Wire Full Duplex or Two Wire Half Duplex mode. -
Page 4: Installation
Installation --------- Power supply The LCS485 is powered by 1) An external DC9V, 100mA power supply(min.) 2) The pin 9 of the RS232 connector Connector RJ-11 (Cross): Point-to-Point application Terminal Block: Multipoint/ Point-to-Point application Figure 1: Connectors and DIP switches... - Page 5 To connect a LCS485 to a DTE device, the slide switch must be set to DCE mode. Set this slide switch before connecting a LCS485 to any device to avoid polarity conflict. LED flashes when LCS485 receives signal from RS485.
- Page 6 Slide Switch Selector There are two slide Switch Selectors on the LCS485 for setting the mode of operation. Both selectors must be properly set before connecting to another device. The right selector DCE Set the LCS485 to DCE mode to be connected to a DTE device, ex.
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Page 7: Connection
DCE or DTE T.on, R.on DCE or DTE Selector settings Right selector should be set to DCE if an LCS485 is connected to a DTE device and be set to DTE if it connects to a DCE device. Both LCS485s can receive and transmit at the same time by different pairs of wires. - Page 8 DCE device. Only one LCS485 can transmit data at a time when its RTS is high. While its RTS is low, an LCS485 is able to receive data. Both LCS485’s should never have their RTS high and transmit data, because there is only one pair of lines for signals.
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Page 9: Multipoint
4-Wire, (RS485) full Duplex / RS422 configuration: One device (Master) sends and receives data; up to 31 other devices (Slaves) receive data all the time and send data only when RTS signal is active. Selector settings LCS485 Left selector Right selector Master T.on, R.on DCE or DTE T.RTS, R.on... - Page 10 Right selector should be set to DCE if an LCS485 connect to a DTE device and be set to DTE if it connects to a DCE device. The LCS485 Master acts as a Master to transmit data to all Slaves (S1, S2…. up to S31) at all time. Only...
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Page 11: Simplex/Transmit, Receive Only
T.RTS, R.RTS DCE or DTE T.RTS, R.RTS DCE or DTE Right selector should be set to DCE if an LCS485 connect to a DTE device and be set to DTE if it connects to a DCE device. Master LCS485 and all the... - Page 12 T.on, R.on DCE or DTE T.on, R.on DCE or DTE Right selector should be set to DCE if an LCS485 connect to a DTE device and be set to DTE if it connects to a DCE device. Master LCS485 and all the...
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Page 13: Monitor
Monitor T.RTS, R.on Moni The right selector must be set to Moni, so the LCS485 becomes a receive-only device. Rx1 +/- signals are converted from RS485 pair to RS232 at DB-25 pin #3. Rx2 +/- signals are converted from another pair of RS485 to RS232 at DB-25 pin#2. -
Page 14: Diagnosis
Diagnosis --------- Should you encounter any problem and wonder if the circuit works. You may conduct a simple diagnostics with a RS-232 terminal (assuming DTE) and the following steps. Set the right selector to DCE, because the RS232 terminal is DTE. Set the left selector to T.on, R.on On the terminal block, use a piece of wire and connect Tx + and Rx + together. -
Page 15: Appendix
DCE device, so some signals can transmit from DTE to DCE and others from DCE to DTE. Mode and pin assignment Signal names and LCS485 and pin of an RS232 connector directions in cables assignment DB-9...
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