Serial wiring diagram
103
Model 2285 Getting Started Guide
C • Cable Recommendations
RS-422/485 serial wiring diagram
Figure 61. RS-485 wiring diagram
*Data+ means that coupling of Tx+(1) pin and Rx+(2) pin
**Data- means that coupling of Tx-(6) pin and Rx-(8) pin
Figure 62. RS-422 wiring diagram
* Termination resistor at Tx side can be omitted if the signal status is good.
120 ohm
Model 2285
**Data-
*Data+
Device
1
Data-
Data+
Device
N - 1
Data-
Data+
120 ohm
Device
N
**Data-
*Data+
N = max 31
RS-485 (Half)
120 ohm
Model 2285
Tx-(6)
Tx+(1)
Device
1
120 ohm
Device
N
Rx-
Rx+
N = max 31
RS-422/485 (Full)
120 ohm
Rx-(8)
Rx+(2)
120 ohm
Tx-
Tx+
Device
N - 1
Rx-Rx+ Tx-Tx+
Rx-Rx+ Tx-Tx+