ZIMO MX638 Series Instruction Manual Download

Page: 36 / 79

Page 36 Non-Sound Decoder MX618 - MX638 and Sound Decoder MX640 - MX659

#182
#183
#184

Servo 2
Servo 3
Servo 4

Function

assignment

90 - 93

101-114

0
0
0

= 1: Single-key operation with F1
= 2: Single-key operation with F2
and so on to
= 28: Single-key operation with F28

= 90: Servo action depends on loco direction:
forward = servo left; reverse = servo right

= 91: Servo action depends on loco stop and direction:
turns right when stopped and direction is forward, oth-
erwise turns left.

= 92: Servo action depends on loco stop and direction:
turns right when stopped and direction is reverse, oth-
erwise turns left.

= 93: Servo action depends on loco movement: turns
right when loco stopped, left when loco moving; direc-
tion has no effect.

= 94: refers to function "Panto1" which is configured in
CV#186
= 95: …"Panto2" configured in CV#187
= 96: …"Panto3" configured in CV#188
= 97: …"Panto4" configured in CV#189

= 101: Two-key operation F1 + F2
= 102: Two-key operation F2 + F3
and so on to
=127: Two-key operation F27 + F28

= 111: Two-key operation F11 + F12
= 112: Two-key operation F3 + F6
= 113: Two-key operation F4 + F7
= 114: Two-key operation F5 + F8

(Two-key mode as defined with CV #161, Bit 2)

#185

Special assignment

for

live steam engines

= 1: Steam engine operated with single servo; speed
and direction controlled with speed regulator, stop
is in center position.
= 2: Servo 1 proportional, on speed regulator, Servo 2
for direction.
= 3: as in 2, but: direction-servo is automatically in

“neutral” if speed is 0 and F1 = ON; If speed

step > 0: direction-servo is engaged.

NOTE to CV #185 = 2 or 3: Servo 1 is adjustable with
CV #162, #163 (end stops); with appropriate values the
direction can be reversed as well.

Servo 2 is adjustable with CV #166, #167.

#186
#187
#188
#189

"Panto1"
"Panto2"
"Panto3"
"Panto4"

Bit 7 = 0: not sound dependent
= 1: sound dependent

Bit 6 - 5 = 00: direction dependent,
            = 01: only if loco drives forward
            = 10: only if loco drives backwards
            = 11: only if F-key is turned off

Bit 4

– 0: key to activate (00001=F1, 00010=F2,

00011=F3,...)

Feedback -

“Bidirectional communication”

All ZIMO decoder types have been equipped with a type of feedback ever since DCC was formed,
which has always been a major difference to competitors’ products:

- the

ZIMO loco number identification

is part of ZIMO DCC decoders since 1997 and as

far back as 1990 with ZIMO’s own data format (which is no longer in use today). It can only be used
with ZIMO DCC systems (MX1…MX10, MX31ZL, MX32ZL…) and together with ZIMO track section
modules (MX9 and successors): After receiving DCC packets, the decoder sends acknowledgment
pulses which will be utilized to identify and locate the decoder in the respective section of track.

- all ZIMO decoders are ready for the

“bidirectional communication”

ac-

cording to

“RailCom”

since 2004; it is operational in newer decoders

such as the MX630 and MX640 series from the beginning (basic functions,
ongoing expansion with future software updates).

“Bidirectional” means that the information transfer within the DCC protocol is not only flowing towards the decoder
but also in the opposite direction; that is, not just driving, function and switch commands are being sent to decod-
ers but also messages such as acknowledgements, actual speed as well as other status information and CV read-
outs are being received from decoders.

The functioning principle of RailCom is based on the introduction of short cut-outs (max. 500 micro seconds) by
the command station to the otherwise continuously sent DCC signal. These cut-outs provide the time and oppor-
tunity for the decoders to send a few bytes of data to locally mounted detectors.

Rel

evant CV’s for RailCom configuration:

Denomination

Range

Default Description

#28

RailCom Configuration

0 - 3

Bit 0 - RailCom Channel 1 (Broadcast)
0 = OFF

1 = ON

Bit 1 - RailCom Channel 2 (Data)
0 = OFF

1 = ON

#29

Basic configurations

0 - 63

14 =

0000

110

Which is
Bit 3 = 1

(“RailCom“

turned on)

Bit 0 - Train direction:
            0 = normal,   1 = reversed
Bit 1 - Number of speed steps:
            0 = 14,  1 = 28
Bit 2 - DC operation (analog):
         0 = off   1 = on

Bit 3 -

RailCom (“bidirectional communication“)

0 = deactivated

1 = activated

Bit 4 - Individual speed table:
0 = off, CV # 2, 5, 6, are active.

1 = on, according to CV ‘s # 67 – 94

Bit 5 - Decoder address:
0 = primary address as per CV #1

1 = ext. address as per CV #17+18

#136

Speed feedback correc-
tion

or km/h

– control num-