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ZM400 Series Indicators Service Manual
8
Option cards
8.2 Current Loop/RS485/RS422 card
shows the Current Loop/RS485/RS422 option card. This provides Current
Loop/RS485/RS422 communication to and from connected devices. See
for information on configuring the indicator and this card.
Figure 8.3 Current Loop/RS485/RS422 card
Pin
Jumper
1
2
3
4
5
6
7
8
9
10
Function
GND (isolated)
XMTA
XMTB
RCVA
RCVB
NC
20ma TX Out
20ma TX Return
20ma RCV Input
20ma RCV Return
P2 - Jumper On = RCV Sinking
P2 - Jumper Off = RCV Sourcing
P1 - Jumper On = Terminated
P1 - Jumper Off = Unterminated
S1 switch settings must
all be OFF to operate.