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 |
|---|---|---|
| 1 | X'mit "B" | Output line to MODEM; 881/882 only |
| 2 | X'mit "A" | Output line to PRINTER or COMPUTER |
| 3 | Rec'd "A" | Input line from COMPUTER |
| 4 | Rec'd "B" | Input line from MODEM; 81/882 only |
| 5 | CTS/Busy | Input Hardwire Handshake |
| 6 | +Vun | Power supply input +7-12 volts DC |
| 7 | +Vun | Same as line 6 |
| 8 | Ground | Digital ground |
| 9 | Ground | Same 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 data | 3 Rec'd data |
| 9 Digital Ground | 5 Digital ground | 7 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 data | 3 Rec'd data |
| 5 CTS "A" handshake | 7 RTS | 20 DTR |
| 9 Digital Ground | 5 Digital ground | 7 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 data | 3 Rec'd data |
| 3 Rec'd data "A" | 3 X'mit data | 2 X'mit data |
| 5 CTS "A" handshake | 7 RTS | 20 DTR |
| 9 Digital Ground | 5 Digital ground | 7 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 Ground | 8 RxD+ Receive data (plus) |
| 9 Digital Ground | 4 Digital ground |
The above description is an electrical subset of X-Rite's PN SE108-79 interface cable (one handshake line missing).
