Figure 25 - 4-Wire N:1 Connection With User-Created Cable; Table 27 - Communication Specifications - York EX Series Installation, Operation & Maintenance Instructions Manual

FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
(Slave)
D-sub 9 pin (socket)
Termination
resistance
Pin Signal name
100 Ω (1/2W)
1
2
Display
3
7
5
4
8
9
6
Shell

FIGURE 25 - 4-WIRE N:1 CONNECTION WITH USER-CREATED CABLE

The following table contains information about the
communication specifications needed for the Modbus
RTU. See Table 13 on page 65 for information about
the Read Command or Table 14 on page 69 for in-
formation about the Write Command.

TABLE 27 - COMMUNICATION SPECIFICATIONS

Communication Protocol
Communication path type
Connector
Function Code
Device
Slave Equipment Address
JOHNSON CONTROLS
D-sub 9 pin (socket)
Shield
Pin
RDA
RDB
SDA
SDB
SG
ERA
CSA
ERB
CSB
Shell
FG
Your own cable
Modbus/RTU
RS422/RS485 Data Length: 8 Bit Stop Bit: 1 Bit Parity: EVEN Speed: 9600 bps
D-Sub 9pin
Read Coil Status:01 Read Holding Register:03
Digital Signal: Coil Analog Signal: Holding Register
1
(Slave)
Shield
Signal name
1
RDA
2
RDB
3
SDA
7
SDB
5
SG
4
ERA
8 CSA
9
ERB
6
CSB
FG
SECTION 4 - TECHNICAL DATA
External Device
(Master)
Signal name
SDA
SDB
RDA
RDB
Termination
SG
resistance
100 Ω (1/2W
FG
LD20947
75
4