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LDM485-P Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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LDM485-P Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers |
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2 / 4 page  23 ® RS-232 P1 P RS-232 P1 P RS-232 P1 P RS-232 P1 P RS-232 P1 Pin Descriptions in Descriptions in Descriptions in Descriptions in Descriptions RS-485 P2 P RS-485 P2 P RS-485 P2 P RS-485 P2 P RS-485 P2 Pin Descriptions in Descriptions in Descriptions in Descriptions in Descriptions Pin 1 Case Case Ground Pin 1 12VAC Pin 2 TD Transmit Data Pin 2 PWR RTN Pin 3 RD Receive Data Pin 3 RTS A Pin 4 RTS Request To Send Pin 4 RTS B Pin 5 CTS Clear To Send Pin 5 CTS A' Pin 6 DSR Data Set Ready Pin 6 CTS B' (connected to Data Pin 7 TD A Terminal Ready) Pin 8 TD B Pin 7 Sig Gnd Signal Ground Pin 9 SIG RTN Pin 8 RLSD Receive Line Signal Detect Pin 10 RD A' Pin 9 +12VDC Positive DC Supply Input Pin 11 RD B' Pin 10 –12VDC Negative DC Supply Input Pin 12 SIG RTN Pin 16 Echo Sup Echo Suppression (tie to pin 17 to enable) Pin 17 Echo Sup Echo Suppression (tie to pin 16 to enable) Pin 20 DTR Data Terminal Ready (connected to Data Set Ready) The LDM485 conforms to EIA RS-232 and RS-485 specifications. Data Terminal Ready must be asserted by the host RS-232 port before the LDM485 can transmit data. When Data Terminal Ready is not asserted, all outputs of the LDM485 are high impedance, allowing up to 64 LDM485 units to be multidropped on a common communications cable. See Figures 1 and 3 for details. Request To Send and Clear To Send are carried through the RS-485 port as two separate wire pairs. These may be used for full duplex flow control. Cable Capacitance Effects On Distances The distances in the specifications are for the wire sizes 18-24AWG (0.82-0.20mm2) with a maximum capacitance of 25pF/ft (82pF/m). For higher capacitance cables, decrease distance specifications for Figure 1. LDM485 Logic Diagram TD RD RTS DTR DSR RLSD CTS + 12VDC Gnd Case RLSD RD DCE DTE TD RTS DTR Light = High = Space +V CTS * Light = High = Asserted +V +V Light = Low = TD/RTS Enabled Light = Low = Asserted Light = Low = Space + - + - 8 7 4 3 B’ A’ RD 12VAC PWR RTN A’ B’ CTS Opto-Iso Barrier +V +V +V -12VDC RTS TD SIG RTN SIG RTN (Isolated RS-485 Ground) * "Light"is presence of light across Opto-Iso barrier. Echo Sup. Echo Sup. +5I 1k 120 1k +5I 1k 120 1k 5 2 1 2 3 4 6 8 5 9 7 1 10 6 9 16 17 20 RS-232 P1 RS-485 P2 TD, RD RTS, CTS, DTR, RLSD Mark =-V; Space = +V Asserted = + V, Not Asserted = -V Mark Space Asserted Not Asserted Aor A’ Low High High Low BorB’ High Low Low High NOTE: Open or Tri-State on RD inputs produces a Mark state, and on CTS inputs produces an Asserted state. TD, RD RTS, CTS 11 12 10 B A B A |
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