6.1.1.Interface Connector Pin Assignments for RS-485
(Full
PIN | MNEMONIC | SIGNAL | DESCRIPTION |
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2 | TX+ | Transmit + | Differential data signal levels to |
8 | TX- | Transmit - | the |
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3 | RX+ | Receive + | Differential data signal levels to |
4 | RX- | Receive - | the |
6.1.2. For RS-485 (Half Duplex – 2 wire)
(Jumper position
PIN | MNEMONIC | SIGNAL | DESCRIPTION |
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2 | TX+/RX+ | Transmit +/Receive+ | Differential data signal levels to |
8 | Transmit | the |
6.2. Interface Connector Pin Assignments for RS-232
Note: an alternate method of connecting to a 2 wire bus is to leave the interface configured for full duplex and externally connect pins 2 and 3 to the (+) bus and pins 4 and 8 to the
6.3.Operation of the Serial Interface
Communication with the serial interface of the Model 2002 is via an ASCII data string. In the
A message to the Model 2002 in the
The
COMMAND SYNTAX
In the following examples of syntax codes, the special characters are explained:
The characters in square brackets [ ] represents a command string, either upper or lower case command characters accepted. All characters must follow each other in the string with no spaces or other characters.
The characters within wavy brackets { } contain choices for the appropriate command.
The characters within the symbols < > are the common abbreviations for the one digit ASCII control codes which they represent, (e.g. <CR> represents carriage return).
When entering more than one command in the same data string, they must be separated by a comma.
All command strings must be followed by the terminator character (carriage return <CR>, also known as ENTER).
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