RX1M-XXX-10 RADIOMETRIX [Radiometrix Ltd], RX1M-XXX-10 Datasheet - Page 6

• Manufacturer Part Number: RX1M-XXX-10
• Description: VHF Narrow Band FM multi channel radio Transmitter & Receiver
• Manufacturer: RADIOMETRIX [Radiometrix Ltd]

Pin description of TX1M/RX1M with Modem mode selected
The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmitter is enabled when valid
serial data is present, so no separate Transmit Enable control is needed. Coding in the data stream also
permits the receiver to ignore noise and only output valid serial data.
Pin Description – TX1M
Pin
1
2
3
4
5
6
7
8
9
10
Pin Description – RX1M
Pin
1
2
3
4
5
6
7
8
9
10
Both the TX1M and the RX1M should be configured to required operating frequency using GOCHAN
command before starting to use the internal 1200 baud modem, because the P1-P3 pins will be used as
Modem Data pins and the modem will operate on the last serially selected channel after SETMOD
command is used to enable the Modem.
For TX1M, TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C6) to MOD TXD (Pin C8) with
no RS232 driver in between. However, in RX1M, MOD RXD (Pin C9) requires an RS232 line driver
before it can be connected to RXD (pin 2) of a serial port. Some of the RS232 line drivers can be powered
from the regulated +4.4V out (Pin C5).
Radiometrix Ltd
PC serial port
SGD
TXD
4
5
1
2
3
Note: Baud rate used for Modem is half that of used for serial configuration. Attached RS232
devices should be set with the following: 1200bps, 8 Data bits, No Parity, 1/2 stop bits, no flow
control
Name
0V
TXE
N/C
N/C
+4.4Vout
PGM
0V
MOD TXD (P1)
MOD N/C (P2)
MOD TXH (P3)
Name
RSSI
N/C
N/C
N/C
+4.4V out
0V
PGM
MOD N/C (P1)
MOD RXD (P2)
MOD CDE (P3)
6
7
8
9
SW1
2400bps
1200bps
MOD TXD
(C8)
0V (C1)
TXE (C2)
PGM (C6)
GND
Figure 5: TX1M and RX1M interfaced to PC serial port in modem mode
4.4V 0ut (C5)
(C7)
100k
Function
Ground
Must be tied to 0V
DC supply. 75mA maximum drain. Only present when TXE is low
Serial programming/configuration input at RS232 level
Ground
Serial data input at RS232 level
Active Low Transmit Hold for continuous transmission (useful for test)
Function
DC level between 0.5V and 2.5V. 60dB dynamic range
(only valid during databursts)
(modem tones or noise present)
(modem tones or noise present)
DC supply. 75mA maximum drain. Present if unit is powered
Ground
Serial programming/configuration input at RS232 level
Modem Received Data at TTL level (requires RS232 driver)
Pull low to enable Carrier Detect on modem operation (not recommended)
TX1M
NPN
100k
UART
uC
Antenna
4.5 - 15V
TX1M/RX1M Data Sheet
4.5 - 15V
Antenna
RX1M
MOD RXD (C9)
+4.4V out (C5)
GND (C6)
PGM
NC (C2)
UART
C
(C7)
1200bps
2400bps
MAX232
VDD
PC serial port
6
7
8
9
4
5
page 6
1
2
3
RXD
TXD
SGD