User's Manual

MaxID RM100 RFID reader interface
Project - RFID ID1170 Version 0.1 18 October, 2005 Page 22 of 24
8.2 Serial Interface
8.2.1 Physical:
Baud rate is set at 38400 b/s, 8 bits even parity, no hardware flow control.
Interface Port Pin-outs
Pin # Description
1 Lithium-Ion Battery + (3.3Vdc to 4.2Vdc)
2 Lithium-Ion Battery + (3.3Vdc to 4.2Vdc)
3 Lithium-Ion Battery - (GND) *
4 Lithium-Ion Battery - (GND) *
5 On/Off Control (Bat+ for ON, GND for OFF)
6 Status output (can be connected to LED via transistor) **
7 NC
8 NC
9 Receive input (RS-232 level)
10 Transmit output (RS-232 level)
* Use this ground for RS-232 ground
** Can be used to bias a NPN transistor or N-channel FET to drive a LED or relay
3V on pin 6 indicate on or yes condition. 0V indicate off or no condition
8.2.2 Protocol:
The interface behaves in a similar manner to the AT command set used by
modems. A command is a text string ended by a carriage return. A response is a
text string ended with a carriage return and line feed. Typically the response is OK
or ERROR n.
When switching on the device, the reader sends the following to the host:
Programming FPGA
Run mode
In this mode, the following commands are accepted:
H or ? Show help screen
I0 Switch transmitter off
I1 IPX at 915 MHz
I2 IPX at 868 MHz
I3 EPC class 1 at 915 MHz
I4 EPC class 1 at 868 MHz
I5 ISO18000-40 mode class 1.19 at 915 MHz
I6 ISO18000-40 mode class 1.19 at 868 MHz
I7 ISO18000-10 mode class 1.19 at 915 MHz
I8 ISO18000-10 mode class 1.19 at 868 MHz