User Manual

Table Of Contents
PM45 and PM45c Accessory User Guide 11
Serial Interface
This section describes how to modify the interface board for RS-232 (standard),
RS-422 isolated/full duplex, or RS-485 isolated/half duplex on the “uart2:” port
and explains the configuration of the interface connector.
One of the circuits shown below will be needed for the serial communication you
want to use.
RS232 Non-isolated (Standard)
Connector Configuration (RS-232 on “uart2”)
Serial
Communication
Honeywell Part
Number
Integrated Circuit Remark
RS-232 Non-isolated 360-018-001 Maxim 238 Already mounted on
board
RS-422 isolated full
duplex
360-027-001 Maxim 1490 full
duplex RS485/422
Intfc, 250Kbps RoHS
Not included in kit,
needs to be purchased
RS-485 isolated half
duplex
360-026-001 Maxim 1480 half
duplex RS485/422
Intfc, 250Kbps RoHS
Not included in kit,
needs to be purchased
Warning: When fitting driver circuit and straps before installing the
interface board, make sure the circuit is not fitted upside down.
Protect the board and circuits from the electrostatic charges