Chapter 5,
Communications
• This chapter contains guidelines for communications connections.
• All ModCon75 Controllers contain two RS232 ports and an RS485.
RS232
• The RS232 serial ports are used for:
• Downloading programs from a PC by authorized MSA Service
Representative
• Communicating to the RS232 to RS485 converter, which
communicates to the Ultima X3 units.
• The RS232 interface is via RJ-11 type serial ports located on the
side of the controller.
NOTE: Turn OFF power before making communications
connections.
NOTE: Do not connect the controller directly to a telephone or
telephone line.
Figure 5-1. RS232 Port Printout
*Standard programming cables do not provide connection points
for pins 1 and 6.
5-1
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