Setup & Com Ports - CalAmp Dataradio HiPR-900 User Manual

3.2.2 SETUP & COM Ports
For serial ports considerations:
•
HiPR-900 radio modem is a DCE
•
Equipment connected to the HiPR-900 SETUP / COM serial port is a DTE
Contact
1
2
3
(1)
4
5
(2)
6
(3)
7
8
9
(1) Depends on connection control mode
(2) Always keeps DSR asserted
(3) Ignores status of RTS (internally always asserted)
(4) For future use
DCD (pin 1) handling by HiPR UART
•
Asserts the DCD signal while sending data on the UART
•
Negates the DCD signal when it no longer has data queued up for TX on the UART
DTR (Data Terminal Ready) (pin 4) signal handling by HiPR UART - Depends on the serial port's con-
nection control mode.
The connection control mode dictates how the HiPR establishes/breaks the connection (referred
to as "session") between the HiPR serial ports and the selected HiPR service (CLI, Serial/RF
bridge, Online Diagnostics, etc.)
•
Permanent (3-wire) connection control - In this mode, the session is permanently established, so
the HiPR ignores the status of the DTR signal.
•
Switched (DTR bringup/teardown) connection control - In this mode, the HiPR monitors the sta-
tus of the DTR signal.
- Upon DTR assertion: the session in established (bringup) phase
- Upon DTR negation: the session in closed (teardown) phase
CTS (Clear to Send) (pin 8) signal handling by the HiPR UART
•
If CTS-based flow control is not used, always asserts CTS
•
If CTS-based flow control is used:
♦ Asserted – If level of unprocessed data in internal RX buffers is below a threshold watermark
♦ Negated – If level of unprocessed data in internal RX buffers is above a threshold watermark
001-5099-000
Table 5 - Pin-out for DCE J11A & B, 9-contact DE-9 connector
EIA-232F Function
DCD
RXD
TXD
DTR
GND
DSR
RTS
CTS
(4)
RING
Signal Direction
DTE
DTE
DTE
DTE
DTE
DTE
DTE
DTE
DTE
10
DCE
DCE
DCE
DCE
--- DCE
DCE
DCE
DCE
--- DCE
HiPR-900 User Manual