Despatch P1400+ Temperature Controller - Manual (Page 28)

22
4.17 Option Slot A
Option Slot A Connections - RS485 Serial Communications Module
If option slot A is fitted with the RS485 serial communication module, connections are as illustrated.
Carefully observe the polarity of the A (Rx/Tx +ve) and B (Rx/Tx -ve) connections.
Figure 27. Option Slot A – RS485 Serial Communications Module Connections
Option Slot A Connections - Digital Input Module
If a digital input module is fitted in option slot A, this may be connected to either voltage free
contacts (e.g. switch or relay), or a TTL compatible voltage. Connections are shown below.
Figure 28. Option Slot A – Digital Input Module Connections
Option Slot A Connections – Basic Auxiliary Input Module
If option slot A is fitted with a basic auxiliary input module, connect as shown. For
1
/
4
-DIN &
1
/
8
-DIN
models it is recommend that the full auxiliary input (Option Slot B) is used instead, as this has
additional features and leaves option slot A free for other modules.
Figure 29. Option Slot A – Basic Auxiliary Input Module Connections
WARNING:
THIS MODULE MUST NOT BE FITTED IF FULL AUXILIARY INPUT IS FITTED IN OPTION SLOT B.
16
17 _
+
16
17 _
+
RS485
A
B
16
17
18
COM