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HC900 Process & Safety Controller User and Installation Manual
Revision 6
21 April 2017
RS-232 Direct Link to PC Configuration Tool (Legacy Controllers)
The Controller can be connected directly to the PC, in which case a Null Modem Cable is required. The
Null Modem Cable can be ordered from Honeywell (Part# 50004820-501). Cable connections are shown
in Table 19.
Table 19
– Null Modem Cable Connections
9-pin D female connector
3-plug connector
Signal Name
Pin No.
Connection
Signal Name
Plug No.
DCD
1
None
RXD
2
Connects to
TXD
2
TXD
3
Connects to
RXD
3
DTR
4
None
GND
5
Connects to
GND
1
DSR
6
None
RTS
7
None
CTS
8
None
RI
9
None
5
1
9
6
4
3
2
8
7
1
2
3
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