41-621.1 HART
®
to Modbus
®
Adaptor Operating Manual
103
APPENDICES
A.
HMA Terminal Block Layout
Notes:
A.
For Modbus devices using ‘A’ and ‘B’ for the
RS-
485 connection, connect ‘A’ to the ‘
+
‘
position of the RS-
485 terminal block, and ‘B’ to the ‘
-
’ position.
B.
The RS-485 terminal block is used as the RS-232 terminal block when the positions 3 and 4
DIP switches are set to the RS-232 mode. See Appendix B. Connect the RS-232 TX line to
the
‘
+
‘ position of the RS
-485 terminal block, and the RX line to the
‘
-
‘ position
.
C.
It is recommended that any wires connected to the HART terminal block be dressed such
that there is some exposed wire. This will permit connecting a HART modem without
breaking the HART loop if additional device configuration or troubleshooting is required.
Summary of Contents for Jupiter JM4
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