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TTDM-128
User Manual
TTDM Network
Access the TTDM Network menu through the Main Menu. The TTDM-Network menu has
the following submenus:
▪ Baud
▪ Modem
▪ 485 Address
▪ TTDM
▪ Terminal
▪ Print Events
These parameters affect only the serial port for external communications (features 22 &
27 in the diagram on page 16). The rst four submenus require password entry.
BAUD
Use this option to select the baud rate of the external communications (host) serial port.
Standard values are from 600 to 19200 baud are available. Default is 9600.
MODEM
This menu item provides access to three submenus:
▪ Auto Answer causes a text string to be sent to the external serial port, which will set a
Hayes compatible modem to auto answer mode.
▪ Dial allows the user to program an 11-digit numerical string into the menu.
▪ Hang-up allows the user to send a hang-up command to an external modem attached
to the serial port.
485 ADDRESS
When more than one TTDM is connected to a host computer on an RS-485 network, each
TTDM unit must be assigned a unique address. This menu allows the user to assign the
TTDM an RS-485 address (the default address is 1). An address of 1 through 20 hex can
be selected, however, 20 should be reserved for testing only. Using addresses 1 through
1F hex allows as many as 31 TTDM’s on one network.
TTDM
Use this menu to select this module to be a Master or Slave.
TERMINAL
Use this option to view a one-line display of characters being sent to or received from the
TTDM external communications serial port. This function is used to verify communications
during system start-up.
PRINT EVENTS
Use this menu selection to send an ASCII text message through the serial port to an
attached serial device (either a directly connected PC running a terminal-emulation
program, a serial printer, or a modem). This function allows the user to download all
events in the Event History Log for later analysis. Do not use this when connected to a
Modbus network, as it may disrupt communications.
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