ACS ACK30 Smart Keyboard - Manual (Page 10)

ACR30 Reference Manual
Version 3.3 January 2009 Page 10 of 44
ACR30
Transmission protocol : serial asynchronous
Parity : none
Data Bits : 8
Stop Bits : 1
6.0. Serial Interface
The ACR30 is connected to a computer through a serial asynchronous interface following the RS-232
standard.
6.1. Communication Parameters
The following communication parameters are used by the ACR30 and cannot be modified by the host
computer:
The ACR30 provides two means to select the transmission speed (baud rate) used by the reader in
the normal operation, by hardware and/or by software.
6.1.1. Hardware Baud Rate
The default hardware baud rate setting is 9600 bps.
6.1.2. Software Baud Rate Selection
The SET_PROTOCOL command allows setting the transmission speed (baud rate) and a delay time
inserted between the bytes transmitted by the reader to the PC.
Please note that the setting made with this command is volatile and will be lost when the reader is
being reset or powered up next time.
6.2. Interface Wiring
For the communication between the ACR30 and a computer, five lines of the RS-232 interface are
used: RxD, TxD, CTS, DTR and GND.