
28
ASCII Protocol - Reference Guide
May ’00
2.4.10
ANTENNA Commands
The ASCII character U and a subsequent character 0 to 2 enable you to address a
specific receive only antenna to be used
The following modes can be specified:
1 = ANTENNA 1
2 = ANTENNA 2
0 = TOGGLE MODE
If the character U is followed by a character other than 0,1 or 2, the entire command
will be ignored. Both command characters will separately be echoed by the reader.
The command acknowledgment is completed with the transmission of carriage re-
turn and line feed.
2.4.10.1 ANTENNA 1 Mode
The ASCII character U and the character 1 cause receive antenna 1 to be connected.
In this mode each correct identification read by antenna 1 is directly transferred to
the PC.
Example:
Comment
PC --> Reader:
U
initiates Antenna mode - command
Reader --> PC:
U
PC --> Reader:
1
switch to antenna 1
Reader --> PC:
1<CR><LF>
2.4.10.2 ANTENNA 2 Mode
Switching to antenna 2 requires the command U2 instead of U1. Apart from the an-
tenna specifier (the number 2 to specify antenna 2) the response format of the reader
is exactly the same as described in 2.4.10.1.
Note:
This command is only applicable to the S2000 reader with RFM-104B.
Note:
The antenna addressing can be changed any time during continuous
reading (NORMAL mode (2.4.8), LINE mode (2.4.7) and GATE mode
(2.4.2)).