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DigiBoard Intelligent Serial Communications Boards
PC/16i+
The PC/16i+ has an additional DB-25 connector on the back of the connector
box assembly. The following table shows the pin assignments for this
connector.
Table 16
PC/16i+ Synchronous Port Pin Assignments (DB-25)
DB-25 Pin #
Signal
Description
Shell
GND
Chassis Ground
2
TxD
Transmitted Data
3
RxD
Received Data
4
RTS
Request To Send
5
CTS
Clear To Send
6
DSR
Data Set Ready
7
SG
Signal Ground
8
DCD
Data Carrier Detect
15
TRxCA
Transmit/Receive Clock
17
RTxCA
Receive/Transmit Clock
20
DTR
Data Terminal Ready
22
RI
Ring Indicator
Pin 15, TRxCA, can be configured as either an input or an output by setting
jumpers J1 and J2, located inside the connector box, near the synchronous port.
To use TRxCA as an input, place jumpers on pins 1 and 2 of both J1 and J2. To
use TRxCA as an output, place the jumpers on pins 2 and 3 of J1 and J2.
NOTE—Contact your DigiBoard sales representative for information regarding
software support for the PC/Xi+ synchronous port.