System
Installation
GMW-25
2-15
2.5.1 Communication
Configuration
The GMW-25 generator is normally shipped with RS-232
communications selected. RS-422 operation is selected by the
insertion of one two-pin jumper, JP3, on the control board. The jumper
is labeled with RS422 on the silk-screening. The control board contains
the circuitry necessary to communicate using the
RS-232/RS-422 protocols via the rear panel of the generator.
A standard 9-pin, female, filtered, type D connector provides the
electrical connection as defined in the table below:
Pin Function
Description
1
TX-
RS 422 TX LO.
2
TX RS232
RS-232 Tx data output.
3
RX RS232
RS-232 Rx data input.
4
RX-
RS 422 RX LO.
5
Digital Ground This pin is connected to the digital ground of the
controller.
6
TX+
RS 422 TX HI.
7
AUX+
Spare RS 422 input HI.
8
AUX-
Spare RS 422 input LO.
9
RX+
RS 422 RX HI.
Hardware Configuration for Remote Digital Interface
Table 2.5.1
The communications protocol used depends upon the Jumper JP3 and
the cable connected to it. The 9-pin D connector is common to both
232 and 422 communications. The pins connected to differentiate the
protocols are in conjunction with JP3.
Содержание GMW-25
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