Denso BHT-4000 User Manual page 89

Transparency
The BHT-4000 uses the non-transparent mode which handles the control characters
and codes (e.g. STX, ETX, and SOH) as starting or ending markers and does not
allow them to be transmitted as normal data in the transmission texts.
RS/CS Control
Depending upon whether the RS/CS control is enabled or disabled in System
Mode, the BHT-4000 operation will differ as follows:
RS/CS Control
Enabled (ON)
Disabled (OFF)
The timeout length is fixed to three seconds in System Mode or Easy Pack 4.2. In
user programs written in BHT-BASIC 3.0, the timeout length is programmable. If
not designated in programming, it becomes three seconds.
For the RS/CS control in user programs written in BHT-BASIC 3.0, refer to the "BHT-
BASIC 3.0 Programmer's Manual."
Chapter 3. Communications Operations of BHT-4000
BHT-4000 Operation
If the CS signal is ON when the BHT-4000 is ready to send,
the BHT-4000 will send data. If it is OFF, the BHT-4000 will
wait for the CS signal to go ON until the timeout occurs.
When the BHT-4000 becomes ready to receive data, it will
turn the RS signal ON.
The BHT-4000 does not check the CS signal when starting
data transmission.
The RS signal is always ON.
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