Terminal Arrangement And Signal Names; Connection Procedure - YOKOGAWA Vigilantplant mR10000 User Manual

3.2 Terminal Arrangement and Signal Names and
the Connection Procedure of the RS-422A/485
Communication Interface

Terminal Arrangement and Signal Names

Connection Procedure

3-2
Rear panel
L
ALARM
N
NO C NC
NO C NC
NO C NC
NO C NC
CHART
NO C NC
NO C NC
REMOTE
1 2 3
4 5 C
RS-422A
SD SD SG
A B G
RD RD FG
A B G
Terminal Name
FG (Frame Ground)
SG (Signal Ground)
SDB (Send Data B)
SDA (Send Data A)
RDB (Received Data B)
RDA (Received Data A)
• Cable
Use the cable that meets the conditions below.
Item
Cable
Characteristic impedance
Capacitance
Cable length
* The transmission distance of the RS-422A/485 interface is not the straight-line distance, but
rather the total length of the (shielded twisted-pair) cable.
• Connecting the Cable
As shown in the following figure, attach a crimp-on lug with isolation sleeves for 4 mm
screws to the end of the cable. Keep the exposed section from the end of the shield
within 5 cm.
Four-wire system
SDA SDB SG
RDA RDB FG
SDA SDB SG
RS-422A
SD SD SG
B
A
RD RD FG
A B
RDA RDB FG
Description
Case ground of the recorder.
Signal ground.
Send data B (+).
Send data A (–).
Receive data B (+).
Receive data A (–).
Conditions
Shielded twisted pair cable
3 pairs AWG24-14 (Four-wire system),
2 pairs 24 AWG or more (Two-wire system)
100 Ω
50 pF/m
Up to 1.2 km*
Two-wire system
Shield
SDA SDB SG
RDA RDB FG
Electric
potential of
the shield
Shield
Electric
potential of
the shield
IM 04P01B01-17E