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Anleitung Zusammenfassung
52TL GE Multilin 215 Anderson Avenue, Markham, Ontario L6E 1B3 Tel: (905) 294-6222 Fax: (905) 201-2098 Toll Free: 1-800-547-8629 (North America) Web Site: F485 COMMUNICATIONS CONVERTER Page 3 of 8 g GE Multilin 805701A1.CDR FEATURES • Converts between RS232, RS485 or Fiber • 1200 to 57600 baud rates • Isolated RS485 interface • 50/125.m, 62.5/125.m, and 100/140.m fiber sizes • Front panel LEDs for power, RS232 Rx/Tx, and RS485 Rx/Tx • Two possible mounting arrangements • 120 V AC (ANOMA AEC-3590 or other listed direct plug-in Class 2 power supply rated maximum 9 V DC output) or 220 V AC adapter included. • Additional power supply terminals supplied to accept isolated 9 V AC / 9 V DC • Two interface cables provided (9pin – 9pin, 9pin – 25pin) • Suitable for use with direct or modem communications. • E83849 UL Listed for the USA and Canada DESCRIPTION The F485 is a self-contained device for converting between RS232, RS485, and fiber optic signals. The converter uses internal switches to select the conversion type (RS232 to RS485, RS232 to FIBER, or RS485 to FIBER) and the RS485 communications baud rates up to 57600 baud. The F485 converter uses the data on the serial port to determine direction and therefore requires no hardware handshaking signals from the computer. The F485 converter can be powered via the power adapter supplied or by connecting an external isolated 9 V AC/DC source to the power supply terminals located at the back of the case. The F485’s versatility and simple design makes it ideal for use with all GE Multilin products in direct and modem communications. TYPICAL CONFIGURATIONS Figure 1: RS232 to RS485 connection Figure 2: RS232 to FIBER and FIBER to RS485 F485 COMMUNICATIONS CONVERTER Page 4 of 8 g GE Multilin CONNECTIONS 805700A1.CDR RS232 COMPUTER FIBER OPTIC RS485 POWER POWER 9V AC/DC Tx Rx COM RS232 FIBER POWER JACK The RS232 connector on the F485 converter accepts a standard 9-pin computer cable. See wiring diagram for pin assignments. The fiber input/output will accept 50/125, 62.5/125 and 100/140um fiber sizes using ST terminated cables. Care should be taken when removing the protective caps to prevent dust from entering the connectors. Connect the supplied power adapter to this input if power is not supplied via the terminals. The power adapter steps down 120/220 VACto 9 VAC. RS485 The RS485 terminals accept a standard shielded twisted pair (such as Beldon 9841) and provide connections for a "+", "-" and a shield. The RS485 terminals have a terminating network installed internally and therefore, no external terminating network is required. Observe correct polarity. POWER TERMINALS The power terminals accept either 9 VACor 9VDCto power the F485 converter instead of using the power adapter. The GND terminal must be connected to ground to ensure adaquate protection against transients. Pin 4 is the main transient ground for the converter. GND 1 2 3 4 5 6 + - + - Figure 3: Connections CONFIGURATION The converter box is configured via two internal dip switch banks which are accessible by removing the converter box cover. Switches A1-A8 are used to set the baud rate for RS485 communications and determine whether the converter is DTE (RS232 direct) or DCE (RS232 modem). Switches B1-B6 are used to select the interface type. The designator for each switch is clearly marked on the printed circuit board. The tables shown below provide a description of each switch within the switch banks. Figure 4: Switch Locator SWITCH A (BAUD RATES) BAUD A1 A2 A3 A4 A5 A6 A7 1200 ON OFF OFF OFF OFF OFF OFF 2400 OFF ON OFF OFF OFF OFF OFF 4800 OFF OFF ON OFF OFF OFF OFF 9600 OFF OFF OFF ON OFF OFF OFF 19200 OFF OFF OFF OFF ON OFF OFF 38400 OFF OFF OFF OFF OFF ON OFF 57600 OFF OFF OFF OFF OFF OFF ON SWITCH B (CONFIGURATION) CONFIGURATION B1 B2 B3 B4 B5 B6 RS232 TO RS485 OFF ON OFF ON OFF OFF RS232 TO FIBER OFF OFF OFF OFF ON ON RS485 TO FIBER ON OFF ON OFF OFF OFF SWITCH A (DTE/DCE) MODE A8 DTE OFF DCE ON F485 COMMUNICATIONS CONVERTER Page 5 of 8 BAUD RATES Two-wire RS485 is half duplex and requires a means for switching between a receive or transmit state. The F485 converter uses the incoming data to control the direction and therefore requires no control signals from the master device (RS232 or fiber) to switch from transmit to receive mode after the last character has been transmitted. The baud rate switches control the length of time that the RS485 transmitter will remain in the transmit direction after the last character has been transmitted. The length of time is fixed at 3.5 character times at the selected baud rate making it suitable for use with Modbus® RTU protocol. When converting RS232 to FIBER, these switches (A1-7) have no effect. DTE/DCE CONTROL The DTE/DCE setting reverses the transmit/receive data lines on the RS232 side. For communications between a computer and a slave device, DTE (direct) should be selected. When connecting the F485 converter to a modem or other...