INSTRUCTION MANUAL

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Page 52 Decoder MX620 - MX622, MX630 - MX632 Sound Decoder MX640 - MX648 Connecting servo and SmartServo motors: 2 servo control outputs are available on the MX620, MX630. MX632 and MX640 decoders for the control of commercially available servo motors or SmartServo RC- 1 (Manufactured by TOKO Corp. Japan). The servo solder pads or pins on the 21- pin or PluX connector can also be used alternatively for SUSI or as logic level outputs. The SUSI and logic level functions are not available if the servo mode is activated (through CV’s #181 and 182, see below); this is also true for the function outputs FO5 and FO6 on the MX632. The models MX632W and MX632WD contain a 5V power supply to power servos directly; the 5V supply on the MX640 is limited to 200mA. For other decoder types, the 5V must be supplied by an external voltage regulator such as the readily available LM7805; connected as shown in the drawing. The outputs can be activated for servo control duty with CV’s #181 and CV #182 (the value in each must be different than 0). With the help of CV #181 and #182, the servo functions can be mapped to various function keys (plus direction) and selected for control with either one or two function keys. CV’s #161 to #169 define the servos end positions and rotating speed, see CV table. CV #161 also defines the appropriate servo protocol. “Normal” for most servos is positive pulses (which is also the default setting); furthermore a selection can be made whether the servo is powered only while it is being moved or remains powered at all times. The latter should only be used if the servo position could change by outside mechanical influences. Connecting MX640 and MX642 to servo and SmartServo motors: Two servo connections are provided on the MX640 for commercially available servos and SmartServo RC-1 (Manufacturer: TOKI Corp., Japan). These are normally the SUSI outputs but can also be used as servo outputs instead. The connections are in the form of either solder pads or part of the 21-pin socket, depending on the decoder type. Each output can be connected directly with a servo input. “Energy-saving” servos (max. 200mA) can be powered directly by the MX640! For servos with higher energy consumptions, the 5V operating voltage must be supplied by an external voltage regulator such as the readily available LM7805 as shown in the drawing. The outputs can be activated for servo control duty with CV’s #181 and CV #182 (the value in each must be different than 0). With the help of CV #181 and #182, the servo functions can be mapped to various function keys (and direction) and selected for control with either one or two function keys. CV’s #161 to #169 define the servos end positions and rotating speed, see CV table. The appropriate servo protocol can be selected with CV #161. “Normal” for most servos is positive pulses (which is also the default setting); furthermore a selection can be made whether the servo is powered only while it is being moved or remains powered at all times. The latter should only be used if the servo position could change by outside mechanical influences. For the SmartServo: Bit 1 of CV #161 must always be set, that is CV #161 = 2!
Decoder MX620 - MX622, MX630 - MX632 Sound Decoder MX640 - MX648 Page 53 MX640… – Complete Schematic including Sound Connections MX642, MX644, MX645 … More recent sound decoder versions are to be wired the same way, except that - ground, switch input and common power are on solder pads on the top side or common power from the blue wire and - only 2 LED outputs (MX642) or none are available, which can be used alternatively to the SUSI pads on the top side solder pads. Also see the decoder schematics on the first pages of this manual. Connecting speaker, cam sensor: In order to operate the MX640 as a sound decoder, the following items must/may be connected: - mandatory – SPEAKER – Any 8-ohm speaker or two 4 Ohm speakers connected in series can be used. Speaker with higher impedance are also allowed but will result in reduced volume. An additional tweeter (also 8 ohms or higher) can be connected, if desired; the connection should be made via a bipolar capacitor (10 uF bipolar for 2 kHz frequency). - optional – CAM SENSOR – Normally, ZIMO decoders are programmed for the “virtual cam sensor”, which can be fine-tuned with CV #267 and CV #354. If a real cam sensor is to be used, the settings of CV #267 must be changed to 0 or 1 depending whether each pulse or every second pulse should trigger a chuff beat. See chapter 6! Mechanical contacts, Reed switches, optical switches and Hall Effect switches are suitable as cam sensors.
Page 1 and 2: Decoder MX620 - MX622, MX630 - MX63
Page 51: Decoder MX620 - MX622, MX630 - MX63

INSTRUCTION MANUAL

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