001-5099-000
HiPR-900 User Manual
10
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
Table 5 - Pin-out for DCE J11A & B, 9-contact DE-9 connector
Contact
EIA-232F Function
Signal Direction
1 DCD
DTE
Í
DCE
2 RXD
DTE
Í
DCE
3 TXD
DTE
Î
DCE
4
(1)
DTR
DTE
Î
DCE
5 GND
DTE
---
DCE
6
(2)
DSR
DTE
Í
DCE
7
(3)
RTS
DTE
Î
DCE
8 CTS
DTE
Í
DCE
9 RING
(4)
DTE
---
DCE
(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