Specifications

Communications 3-3
Single Module Connection
Figure 1.1 shows the connections necessary to attach one module to a host.
Use the Default Mode to enter the desired address, baud rate, and other
setups (see Setups). The use of echo is not necessary when using a single
module on the communications line.
Multi-party Connection
RS-232C is not designed to be used in a multiparty system; however the
D3000/4000 modules can be daisy-chained to allow many modules to be
connected to a single communications port. The wiring necessary to create
the daisy-chain is shown in Figure 3.1. Notice that starting with the host,
each TRANSMIT output is wired to the RECEIVE input of the next module
in the daisy chain. This wiring sequence must be followed until the output of
the last module in the chain is wired to the Receive input of the host. All
modules in the chain must be setup to the same baud rate and must echo
all received data (see Setups). Each module must be setup with its own
unique address to avoid communications collisions (see Setups). In this
network, any characters transmitted by the host are received by each
module in the chain and passed on to the next station until the information
is echoed back to the Receive input of the host. In this manner all the
commands given by the host are examined by every module. If a module in
the chain is correctly addressed and receives a valid command, it will
respond by transmitting the response on the daisy chain network. The
response data will be ripple through any other modules in the chain until it
reaches its final destination, the Receive input of the host.
Figure 3.1 RS-232 Daisy-Chain Network.
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