Table 22: Cable diagram (RS-422/RS485)
Pin connection
RS-422/RS-485
Pin no.
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)
Two-wire type cable diagrams
The following is a sample cable diagram for a two-wire type connection that uses a GP4000 series
(COM2).
Figure 45: Two-wire 1:1 connection with user-created cable
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater
80
