RI-CTL-MB2B-30 Datasheet, PDF (22/40 Pages) Texas Instruments – Series 2000 Reader System

Serial Communication Interface
2.7.1 Interface Configuration
The Control Module firmware uses the following configuration:
Start/Stop bit
X_ON /X_OFF
X_ON = 17_OEC, X_OFF = 19_DEC
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The Data Rate, Parity, Data bits and Handshake can be configured using the S2_Util as described in
Section 2.4.
2.7.2 RS-232-C Interface
The recommendation for connection to a 9-pin sub-D interface connector is given in Figure 2-9.
Figure 2-9. RS-232 9-Pin Interface Connection
2.7.2.1 Activation (RI-CTL-MB2B)
The Data Terminal Ready (DTR) signal is connected to the reset/watchdog circuit of the Control Module.
This ensures a PC controlled microcomputer initialization before the default Read Mode is started.
If you want to run the Control module in a 3-wire connection (RXD, TXD, and GND), without remote
controlled activation, Jumper 5 (JP5) must be closed. This connects DSR and DTR together.
When power is applied to the Control Module the Data Set Ready (DSR) of the RS-232, interface is
activated.
2.7.3 RS-422/485 Interface
Figure 2-10 shows the circuitry of the RS-422/485 Interface. Jumper 2 (JP2) must be closed to provide
line-to-line termination. If the PC is at one end of the line, it must be terminated at its RX+/RX- Inputs. The
reader at the end of the line must be terminated. If the PC is connected somewhere in the middle of the
line, then the readers at either end must be terminated.
Jumper JP4 and JP5 determine which of the two interface types is selected (RS-422 or RS-485). This is
explained in detail in sections 2.7.3.1 and 2.7.3.2.
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Installation
SCBU044 (11-09-21-077) – January 2008
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