Thermo Ramsey Micro-Tech 3000 Series - Page 19

Serial Communications 3104
REC XXXXX 2-7
Table 2-4: Mother Board Wiring Configuration TB 3 – 20mA Serial Communications
Motherboard
20 mA Serial
Communications
TB 3
25 Shield
26
+20 mA (out)
27 -20 mA (out)
28
+20 mA (in)
24 -20 mA (in)
Maximum cable length 4000 ft
Use Beldon 9829 or equivalent
Table 2-5: Mother Board Communication Jumper Settings
JUMPERS
Mode OP1 OP2 OP3 OP10 OP13 OP11
RS-485 “A” “A” “A” “A”
“A” Normal
”B” Multi-drop
“A” Terminated
‘B” Not Terminated
Default
RS-232 “B” “B” “B” “A” “A” Normal
“B” Not Terminated
”A” Terminated
Default
20 mA “A” “A” “A” “B” “A” “C”