BL57-RE
(E)
6-3
Power supply
ground
Power supply
ground
Scale
Controller
FG
FG
Power supply (5 V)
Power supply (5 V)
Send side
Send side
Power supply ground
(Signal ground)
Line driver side
DS34C87
Line receiver side (example)
DS34C86
MC26C32
MC34C86
Receive side
Load 120
Ω
Receive side
Power supply ground
(Signal ground)
6-2. Connection Specifications
6-2-1. A/B Signal Output Type
The line driver used by Magnescale Co., Ltd. is compliant with EIA-422.
Also, based on the EIA-422 standards, the common mode voltage between the line driver and line receiver
is stipulated as
±
12 V.
(Using the scale when the common mode voltage of
±
12 V is exceeded can damage the scale.)
To prevent problems between the control devices connected to this Magnescale Co., Ltd. product, it is
recommended that you connect (shared connection) the signal ground (power supply ground) and set the
load resistance to 120
Ω
. Twisted pair cables (1 turn/1 inch min.) with a core thickness of at least AWG28 are
recommended for the differential signal cables.
(It is even better if the characteristic differential impedance is the same as the load resistance value.)
Fig. 6-3
Receiving power supplied from the controller
Fig. 6-4
Summary of Contents for BL57-RE
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