JOHNSON CONTROLS
85
SECTION 4 - TECHNICAL DATA
FORM 155.30-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
4
TABLE 21 -
CABLE DIAGRAM (RS-422/RS-485)
PIN CONNECTION
PIN.
NO.
RS-422/RS-485
5
1
9
6
LD20598
SIGNAL NAME
DIRECTION
MEANING
1
RDA
Input
Receive Data A (+)
2
RDB
Input
Receive Data B (-)
3
SDA
Output
Send Data A (+)
4
ERA
Output
Data Terminal Ready A (+)
5
SG
Signal Ground
6
CSB
Input
Send Possible B (-)
7
SDB
Output
Send Data B (-)
8
CSA
Input
Send Possible A (+)
9
ERB
Output
Data Terminal Ready B (-)
Shell
FG
Frame Ground (Common with SG)
2-Wire Type Cable Diagrams
The following is a sample cable diagram for a 2-wire type connection. These use a GP4000 series (COM2).
LD20599
)
RDA
RDB
SDA
SDB
SG
100
Ω
(1/2W
2
3
7
5
4
SG
1
Pin
RDB
SDA
SDB
RDA
9
6
CSA
ERB
CSB
ERA
8
100
(1/2W)
Display
Shield
(Slave)
D-sub 9 pin (socket)
Signal name
External Device
(Master)
Your own cable
Signal name
Termination
resistance
Termination
resistance
Shell
FG
Ω
FIGURE 38 -
2-WIRE 1:1 CONNECTION WITH USER-CREATED CABLE
LD20945
)
RDA
RDB
SDA
SDB
SG
100
Ω
(1/2W
2
3
7
5
4
SG
1
Pin
RDB
SDA
SDB
RDA
9
6
CSA
ERB
CSB
ERA
8
100
Ω
(1/2W)
2
3
7
5
4
SG
1
RDB
SDA
SDB
RDA
9
6
CSA
ERB
CSB
ERA
8
Display
Shield
(Slave)
D-sub 9 pin (socket)
Signal name
External Device
(Master)
Your own cable
Signal name
Termination
resistance
Termination
resistance
Signal name
(Slave)
D-sub 9 pin (socket)
Shield
Shell
FG
Shell
FG
Pin
FIGURE 39 -
2-WIRE N:1 CONNECTION WITH USER-CREATED CABLE
