Control Unit IV Reference Manual Setup
529-0004 Ver.3 3-11
3.6.6 Setting up the COM ports
Only the COM 1 and COM 2 parameters can be modified. COM 3 is used for setting up and
troubleshooting the Control Unit. For this reason, you cannot modify this communication
port’s settings.
COM 1 is generally used to connect to a billing system or other type of host computer.
COM 2 may be connected to a secondary host computer, or it may be used to connect two
identical Control Units that have the same setup in a redundancy system. In this situation,
COM 2 takes on its preset values. If you try to change the settings, the message Access
denied will be displayed. The preset values for COM 2 in a redundancy system are shown in
Table 3-3.
Table 3-3: COM 2 synchronization settings for the redundancy system
Parameter Settings
Bits per second ............. 115200
Flow control.................. hardware flow control
Parity ............................ none
Data bits ....................... 8
Stop bits ....................... 1
Protocol ........................ Terminal
To set up the communication ports:
1. Access the setup screen (see section 3.6.5)
2. At the SET) prompt, enter the number of the communication port (1 or 2) to modify and
press <Enter> to display the COM port setup screen.
SET)1
-= COM port setup screen =-
1-Speed
2-Parity
3-Data bits
4-Stop bits
5-Handshaking
6-Protocol
7-Flavor
?-Display menu
q-Quit and return
COM 1=9600 bps, NO parity, 8 data bits, 1 stop bit(s),
NO flow control, Protocol: Terminal, Flavor: Base
COM)
Complete the instructions in the following sections to set up the selected COM port. Repeat
the procedures for the other COM port. If you have two identical Control Units in a
redundancy system, you must set up the COM ports (COM 1 on both units and COM 2 on
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