Dynapro Technologies Dynapro ET TCS, Application Developer'S Manual

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If the address is set to “RS232” or “RS-422” the TCS and host communicate as if they were the
only devices on the communication link. The TCS leaves its transmitter connected to the
communication link at all times, except during power-down and reset.
If the address is set to any value 1 through 32, the TCS operates using multidrop protocol and
responds to the address chosen. Address codes sent by the host with a value greater than P
(greater than address 32) are ignored. When the host addresses a TCS individually, only the
addressed TCS connects its transmitter to the communication link. Regardless of the address
setting, the TCS receiver is always connected.
The effects of multidrop address on control codes received by the TCS are as follows:
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*This code is used in multidrop protocol, but is only transmitted by the TCS and is ignored if received.
The TCS at address 1 plays a special role during broadcast mode. This TCS is the only TCS on
the link to connect its transmitter during broadcast. The TCS at address 1 sends flow control
codes only. It does not send keystrokes or reports (except Ctrl/S and Ctrl/Q keystrokes when
XON/XOFF mode is on). Broadcasting is further described in Chapter 2, Message Transfer
Procedure.