DH Instruments PPCK PLUS, Руководство по эксплуатации и обслуживанию

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 70
Table 10. Pin Designations and Connections
PPCK+ COM1 DB-9F PIN DESIGNATIONS
PIN # FUNCTION DESCRIPTION
2 TxD This pin transmits serial data from the PPCK+ to the host.
3 RxD This pin accepts serial data from the host computer.
5 Grn This pin is the common return for the TxD and RxD signals.
IBM PC/XT DB-9F CONNECTIONS
IBM PC/XT DB-9M TO PPCK+ DB9F
CONNECTION
DB-25M DB-9F DB-9M DB-9F
2 3 3 3
3 2 2 2
7 5 5 5
4.2.1.2 IEEE-488
The PPCK+ IEEE-488 interface is located on the back of the unit. The physical and
electrical interface conforms to IEEE Std 488.1-1987 Subset E2 and IEEE Std.
488.2 1992. You should not attempt to communicate with the IEEE-488 interface
while using the COM1 interface. The IEEE-488 receive buffer is 250 bytes deep.
If you attempt to overflow the buffer, the PPCK+ will hold off release of the NRFD
handshake line until it can service and empty the receive buffer. This keeps the
buffer from overflowing.
4.2.1.3 COM2
The PPCK+ COM2 RS232 interface is located on the back of the unit. It can be used
to allow the Host computer to communicate with another device through the PPCK+.
This allows the user to use one Host COM port to communicate with the PPCK+ and
an additional RS232 device. Refer to the ”PASSTHRU” remote program message
for details.
COM2 is a 9-pin male DB-9M connector configured as a DTE device. Data is
transmitted out of the unit using pin 3, and is received on pin 2. This allows a normal
pin-to-pin DB-9M to DB-9F RS232 cable to be used to connect to a DCE device.
Handshaking is not required or supported.
Table 11. List of PPCK+ COM2 DB-9M Pin Designations
PIN # FUNCTION DESCRIPTION
3 TxD This pin transmits serial data from the PPCK+ to a device.
2 RxD This pin accepts serial data from the external device.
5 Grn This pin is the common return for the TxD and RxD signals.
4 DTR This pin is Data Terminal Ready (DTR) (held at +5 V).