Pinouts - 880 Series Chassis

 

All 880 series densitometers are equipped with RS232-C interface ports. Both the 881 and 882 models (database models) are able to directly interface with Hayes compatible modems. In conjunction with QCLocal, QCNet II, and various OEM software packages, they will store and transmit their data for presentation and analysis at remote locations. Below are listed the pin assignments for these instruments. The 880 (no database) is identical, but lacks the "B" lines and is NOT able to directly drive a modem.

 

Pin #   Function   Description
1X'mit "B"Output line to MODEM; 881/882 only
2X'mit "A"Output line to PRINTER or COMPUTER
3Rec'd "A"Input line from COMPUTER
4Rec'd "B"Input line from MODEM; 81/882 only
5CTS/BusyInput Hardwire Handshake
6+VunPower supply input +7-12 volts DC
7+VunSame as line 6
8GroundDigital ground
9GroundSame as line 8
10 DSR "B"Output handshake to MODEM; 881/882 only

Both the 880 and the 881 are provided with two (2) transmit and two (2) receive lines. Please note the following:

If attaching to a MODEM, the "B" lines are connected!
If attaching a PRINTER or COMPUTER, the "A" lines are connected!

Provision is made for power to be supplied via an external device. If you wish to do so you MUST use both of the +V lines (6 and 7) and both of the ground lines (8 and 9). In addition the power supply must be capable of delivering clean DC current of at least 0.75 amps. Failure to supply CLEAN power to these lines may result in loss of data and unexpected system problems!

IF YOU ARE UNSURE OF YOUR ABILITY TO PROVIDE THE REQUIRED DC POWER - - DO NOT CONNECT AN EXTERNAL POWER SOURCE TO THE DENSITOMETER.

IMPORTANT NOTE:
The 880, 881 are NOT capable of providing a Data Set Ready hardware signal!!! If your hardware requires this signal in order to recognize the existance of an external device, you will have to 'steal' this signal from either YOUR DSR or DTR control line!


Those interested in making their own interface cables - read on!

The schematics below are useful when attaching the instrument directly to the computer. Each of the following varients uses only the 'A' lines of the instrument. A minimum wiring for 'send only' communication (IBM) is as follows:

X-Rite (10c/RJ45)   IBM 9Pin (DB9p)   IBM 25Pin (DB25p)
2 X'mit data "A"2 Rec'd data3 Rec'd data
9 Digital Ground5 Digital ground7 Digital ground

The X-Rite can monitor its line 5 (CTS "A") to see if the receiver (PC, printer, etc.) is ready to accept data. A more complete schematic follows:

X-Rite (10c/RJ45)IBM 9Pin (DB9p)     IBM 25Pin (DB25p)
2 X'mit data "A"2 Rec'd data3 Rec'd data
5 CTS "A" handshake    7 RTS20 DTR
9 Digital Ground5 Digital ground7 Digital ground

If two way communication is desired then one more wire may be added; i.e.:

X-Rite (10c/RJ45)IBM 9Pin (DB9p)     IBM 25Pin (DB25p)
2 X'mit data "A"2 Rec'd data3 Rec'd data
3 Rec'd data "A"3 X'mit data2 X'mit data
5 CTS "A" handshake    7 RTS20 DTR
9 Digital Ground5 Digital ground7 Digital ground

If Pin5 is turned off (instrument I/O configuration), the instrument will not monitor the handshake line from the computer / printer / etc. With most printers this will result in data overflow. With most computers this handshake is not required.


For the Macintosh world the following interface represents a full, bi-directional solution complete with handshaking:

 

X-Rite (10c/RJ45)Macintosh (8pin/DIN)
2 X'mit data "A"5 RxD-  Receive data (minus)
3 Rec'd data "A"3 TxD-  Transmit data (minus)
5 CTS "A"  Handshake In   1 HSKo  Handshake Out
8 Digital Ground8 RxD+  Receive data (plus)
9 Digital Ground4 Digital ground

The above description is an electrical subset of X-Rite's PN SE108-79 interface cable (one handshake line missing).

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