2 SERIES 2000 COMMUNICATIONS MANUAL
M41 Issue 1.1
1.0 GENERAL DESCRIPTION.
The FGH S2000 controller or P2000 programmer all have serial communications fitted as
standard. This takes the form of 2 way serial asynchronous communication with a
computer.
Messages consist entirely of ASCII characters and may or may not contain spaces as
desired.
All messages are terminated with a carriage return, <CR>.
2-Wire EIA-485 (RS-485) or 4-Wire EIA-422-A (RS-422) serial communication standards
are supported.
1.1 Specification.
1.1.1 2-Wire EIA-485 Mode (RS485)
Transmission standard: EIA-485 (RS-485)
Data rates: 1200, 2400, 4800 and 9600 baud.
Data format: 1 start, 7 data, odd parity, 1 stop bit.
Implementation: 2 wire half duplex.
Max drivers per line: 32
Max receivers per line: 32
Max cable length: 1200 metres/3937 feet
1.1.2 4-Wire EIA-422-A Mode (RS422)
Transmission standard: EIA-422-A (RS-422)
Data rates 1200, 2400, 4800 and 9600 baud.
Data format 1 start, 7 data, odd parity, 1 stop bit.
Implementation 4 wire half duplex.
Max drivers per line 1
Max receivers per line 10
Max cable length 1200 metres/3937 feet
2.0 CONNECTIONS.
2.1 General.
The series 2000 may be connected to any computer or device which supports the RS422
or RS485 interface standards. This includes any other communicating instruments such
as the series 1000 or any other instrument using the FGH standard protocol.
The instrument uses a balanced voltage communications system which will perform well
under most situations provided some simple guidelines are adhered to.
1. The communications wiring should be implemented using screened cable comprising
one or two twisted pairs. The cable screen should be earthed at one point only.
2. The cable should be routed well away from sources of electrical noise such as motors,
contactors and any other high voltage wiring.
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