ASCII Protocol
PLX30 Series
User Manual
Ethernet and Serial Gateways
Page 160 of 200
ProSoft Technology, Inc.
September 19, 2012
Transmit-Receive Mode
A port configured in transmit-receive mode can send and receive data from an
ASCII device such as a terminal. This mode functions the same way as transmit-
only mode or receive-only mode, but handles both the transmit and receive
functions. Data flow to and from an ASCII device is handled by the gateway
’s
transmit and receive drivers. Data received from the ASCII device is stored in the
gateway
’s internal database until ready to be sent to an external device. Data
received by an external device is also stored in the gateway
’s internal database
until ready to be transmitted to the ASCII device. The following illustration shows
the data flow when the port is configured for transmit-receive mode:
Configuring a Port for Transmit-Receive Mode
In order to set a port to both receive data and transmit data to an ASCII device,
ensure that the
Rx DB Start
parameter and the
Tx DB Start
parameter both
contain values that specify data storage starting locations. A
-1
value in either
parameter will disable the particular function that the parameter serves.