Watlow Series 982 - Manual (Page 118)

9.4 WATLOW Series 982 User’s Manual
Software Features, Chapter 9
Communications
Overview
The serial communications feature allows the Series 982 family to receive
commands from and transmit data to a master device, usually a comput-
er. Any function that can be performed via the front panel, can also be
accomplished using a serial communications port, allowing you to operate
the controller from a computer and to store process data on a computer.
The Series 982 is available with a choice of serial hardware interfaces. An
EIA-232 interface allows for one master (computer) and one controller,
with a maximum network length of 50 feet (15 meters).
The EIA-485/EIA-422 option equips the controller for a multi-drop inter-
face: up to 32 total network devices with EIA-485 and up to 10 total net-
work devices with EIA-422. Each controller will have its own unique
address. The total maximum network length is 4,000 feet (1,219 meters).
All interfaces are isolated.
To select between EIA-485 or EIA-422, enter the Setup Menus by holding
the up-arrow > and down-arrow < keys simultaneously until setup
[`SEt] appears in the bottom display. Use the up-arrow key to select the
Communications Menu [COM]. At the interface prompt [IntF] select
between [`422] or [`485].
Other parameters that must be configured in the Communications Menu
[COM] are the baud rate [bAUd], data bits and parity [dAtA], protocol
[Prot], and device address [Addr]. The protocol prompt must be set to
full (ANSI X3.28 2.2-A3) if multiple devices are used with the EIA-485 or
EIA-422 interface. If the full protocol is selected, a device address must be
selected at the address prompt. For EIA-232, full [FULL] or on [``On]
(XON/XOFF) protocol may be selected.
Requirements
Choose which interface your application will use: EIA-232 serial communi-
cations (98_C-____-_R__), or EIA-485/EIA-422 serial communications
(98_C-____-_S__), or EIA-232/EIA-485 serial communications (98_C-____-
_U__. The computer must have a compatible serial port or an appropriate
converter must be used.
Software