Watlow CAS - Manual (Page 39)

Installation
CAS User’s Guide 29
Wire equipment in a single "daisy chain" using twisted shielded pairs
for the RS-485 cables. Don't use "octopus connections" or "spurs".
Use a 200 ohm terminating resistor on the RX line of the last system in
the system. (If you have only one system, it is the last system in the
system.) Use jumper JU1 to select the terminating resistor; place it in B
position for termination and A position for non-termination.
NOTE
Connect the shields to earth ground only at the computer or other
485 interface. Do not connect the shield to the CAS. If the RS-485
communications do not function properly, or if you have measure-
ment problems when communications lines are connected, contact
Watlow Anafaze Technical Service Department.
RXA #25
RXB #23
TXA #26
TXB #24
A
B
A
B
JU1 JU1