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A1000 and A2000 SERIES
CONVERTER BOXES
USERS MANUAL
R E V I S E D : 5 / 1 / 9 5
DGH CORPORATION
P O B O X 5 6 3 8
MANCHESTER, NH 03108
T E L E P H O N E : 6 0 3 - 6 2 2 - 0 4 5 2
F A X : 6 0 3 - 6 2 2 - 0 4 8 7
WEB: www.dghcorp.com
The information in this publication has been carefully checked and is
believed to be accurate; however, no responsibility is assumed for
possible inaccuracies or omissions. Applications information in this
manual is intended as suggestions for possible use of the products and
not as explicit performance in a specific application. Specifications may be
subject to change without notice.
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Summary of Contents for DGH A1000 series
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Page 1: Users Manual
CONVERTER BOXES USERS MANUAL R E V I S E D : 5 / 1 / 9 5 DGH CORPORATION P O B O X 5 6 3 8 MANCHESTER, NH 03108 T E L E P H O N E : 6 0 3 - 6 2 2 - 0 4 5 2 F A X : 6 0 3 - 6 2 2 - 0 4 8 7 WEB: www.dghcorp.com... -
Page 2: General Description
A1000 & A2000 USERS MANUAL 2 GENERAL DESCRIPTION The A1000 and A2000 series converter boxes convert RS-232 communications signal levels to the correct electrical signals required by RS-485. The RS-485 communications standard is recommended when many modules, or other addressable devices, must be connected to a host computer over long distances. -
Page 3: Specifications
(B) Black, (R) Red, (G) Green and (Y) Yellow. All DGH hardware using RS-485 contains this color coded nomenclature. Figures 1A & 1B show the rear panel connections... - Page 4 A1000 & A2000 USERS MANUAL 4 A 1 0 0 0 / 2 0 0 0 R S - 2 3 2 D B - 9 C O N N E C T O R The A1000 and A2000 contain a female DB-9 connector normally used with modems or other Data Communications Equipment (DCE).This connector should be connected to a host computer, or controller, when converting RS-232 signals to RS-485.
- Page 5 5 A1000 & A2000 USERS MANUAL This connector is left open when the A1000 or A2000 is used as an RS- 232-to-RS-485 converter. A 1 0 0 0 / 2 0 0 0 R S - 4 8 5 O U T C O N N E C T O R The A1000 and A2000 converters contain a four-pin screw terminal plug labelled RS-485 OUT.
- Page 6 A1000 & A2000 USERS MANUAL 6 BAUD RATE The A1000 and A2000 series converters each contain a 10-position DIP switch located on the rear panel. The DIP switch is used to select the correct communications baud rate and must be set to the same value as the devices connected to the RS-485 OUT connector.
- Page 7 7 A1000 & A2000 USERS MANUAL should be placed at each end of the RS-485 cable. Please refer to Figure 2 for a typical RS-485 system application. The A1000 and A2000 each contain the biasing and termination resistors necessary to interface any equipment on an RS-485 network. These resistors are switch-selectable making it easier to interface the A1000 and A2000 to other pieces of equipment that may or may not contain the biasing and/or termination resistors.
- Page 8 A1000 & A2000 USERS MANUAL 8 A2000 RS-485 TERMINATIONS Proper biasing and termination resistors in the A2000 may be enabled by using the internal jumpers contained in the A2000. Figure 3 shows the location of the jumpers on the A2000 printed circuit board. The jumpers are shown in the factory setting to enable a resistor, insert a jumper into the jack position adjacent to the resistor nomenclature written on the A2000 printed circuit board.
- Page 9 9 A1000 & A2000 USERS MANUAL Figue 4a,b and c show simple wiring diagrams for both the A1000 and A2000 used as RS-232/RS-85 converters and RS-485 repeaters. Figure 4a Wiring diagram for RS-232/RS-485 converter with host DB-9 connector. Figure 4a Wiring diagram for RS-232/RS-485 converter with host DB-25 connector.
- Page 10 A1000 & A2000 USERS MANUAL 1 0 Figure 4c Wiring diagram for RS-232/RS-485 converter and RS-485 repeater .
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