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3.2 RS-232 SERIAL INPUT
The VSI-Pro Max accepts serial data via the DB-9 Female connector located on the rear of VSI-Pro Max. This
connector is similar to “AT” type computer RS232 serial ports and the pin out is identical. Table 1 shows the standard
pin out for VSI-Pro Max RS-232 female connector. On the other hand Table 2 compares the VSI-Pro Max RS-232
with standard “AT” computer’s RS-232 connector.
Table 2: RS-232 DB-9 Pin-Out vs VSI-Pro Max DB-9 Pin-Out
Table 1: Pin-Out of the DB-9 Female Connector on the VSI-Pro Max
1 Alarm Out 1 From VSI-Pro Max Open Collector Transisitor
2 Receive Data To VSI-Pro Max Data from Cash Register
3 Transmit Data From VSI-Pro Max Data to Cash Register
4 DTR From VSI-Pro Max Remain High or RS-485 Input (+)(A)
5 Ground ------------------- Signal / Power Gnd or Isolated RS-232 Input Gnd
6 DSR From VSI-Pro Max Remain High or RS-485 Input (-)(B)
7 RTS To VSI-Pro Max Alarm Input or Hardware Handshaking
8 CTS From VSI-Pro Max DVR RS-232 Output or Hardware Handshaking
9 Alarm Out 2 From VSI-Pro Max Open Collector Transistor or Signal / Power Gnd
Pin # Label Direction Function
CONNECTIONS
VSI-Pro Max POS / Cash Register Interface
1 CD (Carrier Detect ) Alarm Out 1
2 RXD ( Recieve Data ) RXD
3 TXD ( Transmit Data ) TXD
4 DTR ( Data Terminal Ready ) Aways True
5 SG ( Signal Control ) GND
6 DSR ( Data Set Ready ) Aways True
7 RTS ( Request to Send ) RTS ( Option)
8 CTS ( Clear to Send ) CTS ( Option)
9 RI ( Ring Indicator ) Alarm Out 2
PIN # SIGNAL NAME ( RS232 )
VSI-Pro Max