- Pin 5 Signal Ground – RS-232 ground and also radio/modem chassis ground potential.
- Pin 7 Request to Send – RTS raised to RS-232 “High” to start transmit mode and prepare modem to receive data.
- Pin 8 Clear to Send – CTS return RS-232 “High” to RTU/PLC 30 mSec after RTS is raised. Modem is ready to receive
data.
DOX mode operation does not require RTS/CTS handshake control. When data is received on Pin 3 (TXD), data is
buffered and the radio is set to transmit mode. Data is transmitted when the radio/modem is ready to send it.
DOX mode requires 3 wire connections for operation. These are as follows. (See Figure 3 and Table 4, earlier in this
User Manual.)
- Pin 2 Receive Data – Data received by radio and output to a RTU/PLC.
- Pin 3 Transmit Data — Data sent to modem to be transmitted by the radio.
- Pin 5 Signal Ground – RS-232 ground and also radio/modem chassis ground potential.
For technical assistance, contact CalAmp Wireless Network Group Technical Service at
wngsupport@calamp.com.
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 89
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