You can find the following terms used throughout this manual
Auto Answer- type of modem that has self-contained timeouts and tests They can answer
and hang the phone up automatically
Backplane Current Draw -- The amount of current the module requires from the
backplane The sum of the backplane current draw for all modules In a chassis is used to
select the appropriate chassis power supply
Baud Rate- The speed of commutation between devices on a network. All devices must
communicate at the same baud rate. For example, the DH-485 network devices default to
Calculated Watts- The amount of heat generated by those points energized on an I/O
Channel- Communication port on a module.
Chassis- A hardware assembly that houses devices such as I/O modules, adapter modules,
processor modules, and power supplies
Continuous Current Per Module- The maximum current for each module The sum of the
output current for each point should not exceed this value
Continuous Current Per Point- The maximum current each output is designed to
continuously supply to a load
CPU- Central Processing Unit or processor
DF1 protocol-A peer-to-peer link-layer protocol that combines features of ANSI X3 28-
1976specification subcategories D1(data transparency) and F1 (two -way simultaneous
transmissions with embedded responses).
Direct Connect- type of modem that is connected to a dedicated, leased phone line and is
active at all times.
DH-485 Network- The DH--85 network is a collection of devices connected to the
communication cable allowing information exchange. A communication network based on
the EIA Standard for RS-485 using an Allen-Bradley proprietary protocol.
DTE Controlled Answer- type of modem that is unattended and is attached directly to the
phone lines. The Interface module or the 5/03 processor acts as the Data Technical
Equipment (DTE) which Controls the modem via the DTR, DSR, and DCD signals The
module incorporates timeouts and tests to properly operate these types of modems.