Manual Modem 1200 baud 500FSD10 EDS500 series - FSK modems Application, characteristics and technical data have to be taken from the hardware data sheet: 500FSD10 Data sheet 1KGT150982 Operation The 500FSD10 modem is a CCITT V.23 modem for snap-in DIN-rail mounting. V.23 operates with the frequency shift keying method (FSK). The modem can operate in two- and four-wire connection. The mode of operation is set by means of a twelve-fold DIP-switch. Connections Power connector for compact devices (X1) The EDS500 series devices are equipped with a wide range power supply for voltages between 24 and 60 Volts (power consumption see device label). The connector is a 3-pin Phoenix plug with screw terminals. Pin allocation power supply 1 2 3 Pin 1 VIN+ (24-60 VDC) 2 Shield connected to functional earth 3 VIN- ADVICE Due to the internal overvoltage protection, interrupt any connection to ground of the device for the time of the measurement before you carry out isolation measurement. This includes the earthing of the hat rail as well as all shields of all transmission lines and supply feedings. RJ-12 plugs or RJ-45 plugs can establish earthing via the shield. Serial Interface to DTE (X2) The RJ-45 connector X2 forms an RS-232-D interface. If the modem is connected to a terminal unit, an adapter cable has to be used which connects the pin pairs. Pin allocation serial interface DTE (RJ-45) 8 1 RS-232-D Pin V.24 V.28 Direction 1 DSR M1 107 output 2 DCD M5 109 output Pin allocation serial interface DTE (RJ-45) 3 DTR S1 108.2 input 4 GND GND - 5 RxD C2 104 output 6 TxD D1 103 input 7 CTS M2 106 output 8 RTS S2 105 input Interface to transmission line (X3) In two-wire mode X3-1 and X3-2 form terminal NF1 which is used for transmission and reception. In four-wire mode X3-1 and X3-2 form the transmitter terminal NF1 and X3-3 and X3-4 form the receiver pair NF2. NF terminals transmit receive 2-wire NF1: X3-1 and X3-2 NF1: X3-1 and X3-2 4-wire NF1: X3-1 and X3-2 NF2: X3-3 and X3-4 Pin allocation transmission line interface (X3) 4 3 2 1 ing Pin 1 NF1a 2 NF1b 3 NF2a 4 NF2b LED Description Function Power RTS Voltage Supply Request to send off green off green Device is without power supply Power supply switched on DTE does not send DTE requests to send via the modem
LED Description Function CTS DCD Settings Clear to off CTS inactive send green The CTS is switched on when the carrier is being established. A transmit delay time of 20-30ms has to be adjusted in DTE settings. off green No signal received received from DTE The DIP-switch S1 establishes the mode of operation of the modem. Switch C-1 is reserved for future use. C-2 establishes a permanent carrier on the line which is useful in a fourwire fullduplex connection. Switch 2-W distinguishes between two-wire and four-wire operation of the modem. In two-wire mode X3-1 and X3-2 form terminal NF1 which is used for transmission and reception. In four-wire mode X3-1 and X3-2 form the transmitter terminal NF1 and X3-3 and X3-4 form the receiver pair NF2. The next three switches belong to the transmitter amplitude. In a long multi-drop line configuration, where the modem in the central needs a high amplification factor to receive the signal of the last modem, the transmission level of the modem next to the central station can be reduced by 20 db with the 20dB switch. This is done to avoid overdrive of the receiver in the central station modem. To compensate a low-pass character of the transmission line, the amplitude of the upper transmission frequency can be increased by 20 %, 40 % and 60 %. If both switches 20% and 40% are off, no increasing of the amplitude takes place. The 500FSD10 has five predefined receiver amplifications: 0 db, 10 db, 20 db, 30 db and 40 db. These are set by the switches 10dB to 40dB. Only one amplification DIP switch is allowed to be in the 'on' position at a time. If the 500FSD10 is to be terminated with the line impedance, the DIP switches T-T and T-R need to be switched to 'on'. This is usually the case at both ends of the line. If the modem is to be connected in a partyline manner in between, these DIP switches have to be off. T-T terminates the low frequency (LF) line NF1, which is formed by terminals X3-1 and X3-2. T- R terminates the receiver pair NF2 of the four-wire configuration with terminals X3-3 and X3-4. -20dB left off normal sending power right on decrease sending power by 20 db 20% both raising raise upper factors active: 60 frequency % amplitude by 20 % 40% of upper frequency amplitude, none active: no raise 10db 20db 30db 40db T-T T-R Safety only one factor allowed to be active, all off: 0 db no termination NF1 (> 6 kω) no termination NF2 (> 6 kω) DANGER raise upper frequency amplitude by 40 % 10 db amplification 20 db amplification 30 db amplification 40 db amplification line termination NF1 line termination NF2 Interrupt the power supply before mounting or dismounting the device. WARNING An easy to access manual interrupter has to be installed into the power feed of the modem to be able to disconnect the modem from the power supply in the case of an emergency. WARNING The DC power supply has to fulfil the following requirements in order to supply appropriate fire protection: Limited power source according to IEC 60950-1 or PS2 classified according to IEC 62368-1 Short-circuit current < 8A WARNING No plug shall be freely accessible in normal operation due to safety reasons. left off right on C-1 for future use for future use C-2 switch on sender with RTS carrier always active (four-wire) 2-W four-wire mode two-wire mode
Installation ADVICE The 500FSD10 modem is a protection class II device with functional earthing. Functional earthing must be done properly in order for the overvoltage protection of the modem to work properly. Correct functional earthing is accomplished by snapping the modem on the properly earthed DINrail (making contact to backside functional earth contacts) and additionally connecting terminal X1-2 (SHIELD) to an earthing terminal on the DIN-rail. "Fig. 4: Schematic installation drawing" shows a schematic drawing of the correct installation of the modem. X1-2 has to be connected to functional earth. Terminal X1-1 is connected to the positive terminal and X1-3 to the negative terminal of a DC power supply. The communication line can be either connected in two-wire or four-wire configuration. For two-wire configuration connect terminal X3-1 and X3-2 to the pair of wires. For four-wire configuration connect terminal X3-1 and X3-2 to the pair of wires used for transmit direction and X3-3 and X3-4 to the pair used for receive direction. The internal transformers of the 500FSD10 have a galvanic isolation of 3 kv. If a higher level of protection is needed, additional isolation lowfrequency (LF) transformers have to be used. See "Fig. 5: Communication line connection by LF transformer (two-wire connection)" and "Fig. 6: Communication line connection by LF transformer (four-wire connection)" for the installation scheme. Finally, the serial interface has to be connected to the local data termination equipment (DTE) by connecting X2 of the 500FSD10 to the serial interface of the DTE by a shielded serial cable, e.g. 500CAB08, 500CAB09.
Figure 1: 560FSD10 Figure 2: 500FSD10 Front plate Figure 3: 500FSD10 Label X1 1 2 3 X2 1... 8 Connect DIN-rail to Protection earth X3 1 2 3 4 Figure 4: Schematic installation drawing T-R NF2a NF2b NF2 T-T NF1a NF1b NF1 S P Figure 5: Communication line connection by LF transformer (two-wire connection)
NF2a T-R NF2b NF2 NF1a S P Receive T-T NF1b NF1 LF signal transformer S P Transmit Figure 6: Communication line connection by LF transformer (four-wire connection)
ABB AG Power Grids P.O. Box 10 03 51 68128 Mannheim, Germany Tel. +49 621 381-3000 www.abb.com/remote-terminal-units We reserve the right to make technical changes or modify the contents of this document without prior notice. With regard to purchase orders, the agreed particulars shall prevail. ABB AG does not accept any responsibility whatsoever for potential errors or possible lack of information in this document. We reserve all rights in this document and in the subject matter and illustrations contained therein. Any reproduction, disclosure to third parties or utilization of its contents in whole or in parts is forbidden without prior written consent of ABB AG. Copyright 2019 ABB AG All rights reserved 1KGT150983 V000 1