599 Menlo Drive • # 100 • Rocklin, CA 95765
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Web: http://www.parallaxinc.com or http://www.stampsinclass.com • Email: [email protected]
1-27-2000, V1.0 • Mfg. by www.
RFDigital.com
Page
5
RF MODULES
PIN 1:
GND: (Input) Ground pin. Connect to power supply ground.
PIN 2:
+5VDC: (Input) Power Supply pin. Connect to reg5VDC, +/- 0.250 VDC.
PIN 3:
MODE: (Input) Serial/Switch Mode Pin. The Mode Pin, determines if module will operate in switch
mode or in serial mode. This pin has an internal pull down; leaving it open will be same as connecting it to
ground. This pin can be left open if only switch mode is to be used. Switch mode = 0VDC, Ground, Low, Logic
0, Open. Serial mode = 5VDC, High, Logic 1. Changes on this pin can take up to 1 second to take effect. This
pin can be changed on the fly, while power is applied.
PIN 4:
TXD: (Input) Serial TX Data Input Pin. This pin is used to enter serial data for the transmitter to send.
Serial data should be sent at 9600 Baud, 8 Data Bits, No Parity, 1 Stop Bit. Standard Serial Protocol.
CAUTION:
THIS IS NOT RS232! The module’s levels are +5VDC and ground (CMOS logic levels). RS232
levels 10V and -10V, levels which will damage the module. If connection to an RS232 port is desired,
special circuitry is required to protect the input to the module. Continuous 9600 baud data cannot be input to this
pin, at least 15 millisecond spacing must be provided between the bytes. This pin only functions in Serial Mode.
PIN 5:
TXFLO: (Output) Serial Flow Control Pin. This pin is used to achieve maximum serial throughput. The
module accepts data at 9600 baud but can only transmit between modules at 1200 baud. This pin is optional,
but can be used to automatically pace the data for maximum efficiency. This pin should connect to the device
that outputs the 9600 baud serial data to the module. When the module is ready to accept a 9600 baud byte,
this pin will be low. When the module is not ready to accept a 9600 baud byte, this pin will be high. The sending
device should monitor this pin to know exactly when the module is ready accept another byte for maximum data
transfer efficiency. The BASIC Stamp 2 and BASIC Stamp 2sx has a built-in flow-control pin feature in the
SEROUT command that works perfectly with the TXFLO pin. This pin only functions in Serial Mode.
PIN 6:
RXD: (Output) Serial Receive Data Pin. This pin outputs serial data that is received by the receiver.
Serial data rate is 9600 Baud, 8 Data Bits, No Parity, 1 Stop Bit. Standard Serial Protocol.
CAUTION:
THIS IS
NOT RS232, its levels are +5VDC and ground, CMOS logic levels. RS232 levels 10V and -10V, levels
which will damage the module. If direct connection to an RS232 port is desired, special circuitry is required to
protect the input to the module. This pin only functions in Serial Mode.
PIN 7:
NC: (Input) NO Connection. Leave this pin open. Do not ground or terminate.
PIN 8:
IN1: (Input) Switch Input 1. Internally pulled down. When left open this pin is logic low. When
connected to +5VDC this pin is logic high. A logic high on this pin will send a "1" to the receive pin OUT1. This
pin only functions in Switch Mode.
PIN 9:
IN2: (Input) Switch Input 2. Internally pulled down. When left open this pin is logic low. When
connected to +5VDC this pin is logic high. A logic high on this pin will send a "1" to the receive pin OUT2. This
pin only functions in Switch Mode.
PIN DESCRIPTION
