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Rev Australasia V2.3 12/04

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Serial Data Communications

The Panel Reader is provided with RS232 serial communications interfaces. RS232 is

generally used in short run (less than 15 meters/50 feet) configurations where the data

recording equipment is provided with a compatible RS232 interface. Longer cable lengths are

possible also when data communications rates are low (9600 bits/second and lower). A

standard 5 metre cable is provided.

When long cable lengths are required between the Panel Reader and the data recording

equipment, when data communications rates greater than 9600 bits/second are being used, or

when bus communications are being used, the Panel Reader’s RS422/RS485 option should be

discussed with Allflex.

Note - Serial communications for all interfaces are half duplex – that is, communication

exists both to and from the Panel Reader, but not simultaneously. While ID Code data is

being transmitted from the Panel Reader, communications to the Panel Reader cannot be

received simultaneously.

Note - RS232 and RS422/RS485 interfaces are concurrently enabled but only RS 232 is

wired to the connector on the control box. At all times, the Panel Reader can receive

commands through either interface. However, both interfaces are coupled to a single receive

input pin on the Panel Reader’s internal circuitry. Consequently, if inputs are applied

simultaneously on both RS232 and RS422/RS485 interfaces, the commands will collide and

be unrecognizable to the Panel Reader. The user should employ only one of the interfaces for

sending commands to the Panel Reader.

Note - Both RS232 and RS422/RS485 outputs can be simultaneously used. For example,

the RS232 output could be connected to a weigh-scale and the RS422 output could be

connected to a data recording device. Only one of these two user equipments should,

however, have its transmit output connected to the Panel Reader’s receive input, as is

explained earlier.

RS232 Serial Data Interface

The RS232 serial data interface comprises a 3-wire arrangement, consisting of transmit

(TxD), receive (RxD), and ground (GND). This interface can be configured for a variety of

communications parameters, but is factory configured with default settings of 9600

bits/second, no parity, 8 bits, and 1 stop bit (“9600N81”), and no flow control. To determine

the required settings, refer to the interface requirements for the data recording application that

is being used with the Panel Reader. To change these default settings, please see

“Configuration Options” section.

Serial data appears on the Panel Reader’s TxD connection in ASCII format, and is compatible

with most PC terminal emulator programs, such as HyperTerminal®. Configuration options

provide flexible formatting of transponder ID code information (see “Configuration

Options”). The default formats for ISO transponder tag types are listed in Table 2 on page 2

of this guide.

RS422/RS485 Serial Data Interface

The Panel Reader’s RS422/RS485 is not wired from the circuit board unless specifically

required. RS422/485 serial data interface comprises a balanced 4-wire (RS422) or balanced

2-wire (RS485) arrangement, which is capable of being used in any of several wiring

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