From the 200 manual....
To connect to the controller using serial cable:
1. Connect an RS-232 straight DTE serial cable between the PC's serial port and the controller's Maintenance port.
2. Program the PC's serial port (from the communication program) with the following settings:
Baud Rate: 9600 (to change, see Setting the Maintenance Port Baud Rate)
Stop Bits: 1
Data Bits: 8
Flow Control: None
Parity: None
3. Verify the connection as follows:
a) In the VT-100 emulator or other communications program, press RETURN.
b) If the connection is functioning, a prompt to "Press Return Four Times to Login" displays.