Main And Main2 Eia Communications Interface; Appendix D: Eia Connections - AT&T 730 MTG User Manual

Appendix D: EIA Connections
Main and Main2 EIA Communications Interface
You can connect your 730 MTG Terminal to a host computer using the
terminal's EIA RS232 interface ports. The interface ports are capable
of operating at speeds up to 19200 bits per second. Speed is
selectable from the Setup Menu and the baud setting you choose
takes effect immediately (see Chapter 4, "Setup," for more information).
The six selectable speeds are 300, 1200, 2400, 4800, 9600, and
19200. The default speed setting is 9600.
The output signals of this interface are +5V dc to + 12V dc for an on or
a space condition. The off or mark condition is signalled by a voltage
level of -5V dc to -12V dc with respect to ground. All input lines
respond to normal EIA RS232 voltages.
Each port uses half of a DUART. The DUART provides input lines for
CTS (Clear to Send), DSR (Data Set Ready), DCD (Data Carrier Detect),
and RD (Receive Data); and an output line for RTS (Request to Send),
DTR (Data Terminal Ready), and TD (Transmit Data). RTS/CTS
hardware flow control is only supported on Main. See the table on the
next page for pin definitions.
For cabling information, refer to Chapter 1 of this User's Guide.
EIA Connections 0-1