Appendix A. CS I/O 9 Pin Serial Port
TABLE
ABR = Abbreviation for the function name.
PIN | = Pin number. |
| ||
O | = Signal Out of the datalogger to a peripheral. | |||
I | = Signal Into the datalogger from a peripheral. | |||
|
|
|
|
|
PIN |
| ABR | I/O | Description |
|
|
|
|
|
1 |
| 5V | I | 5 VDC supply. Not used. |
|
|
|
|
|
2 |
| SG |
| Signal Ground: Provides a power return for pin 1 |
|
|
|
| (5V), and is used as a reference for voltage levels. |
|
|
|
|
|
3 |
| RING | O | Ring: Raised by the modem to put the datalogger |
|
|
|
| in the telecommunications mode. |
|
|
|
|
|
4 |
| RXD | O | Receive Data: Serial data transmitted by the |
|
|
|
| modem are transmitted on pin 4. |
|
|
|
|
|
5 |
| ME | I | Modem Enable: A logic high internally switches |
|
|
|
| power to the modem. A logic low internally |
|
|
|
| powers down the modem. |
|
|
|
|
|
6 |
| SDE | I | Synchronous Device Enable: A logic high disables |
|
|
|
| communication with the modem, without removing |
|
|
|
| power or changing the modem’s mode. |
|
|
|
|
|
7 |
| Clock/ | I/O | Clock/Handshake: Used with the SDE and TXD |
|
| HS |
| lines to communicate with devices that address it. |
|
|
|
|
|
8 |
| TE | I | +12 VDC power supply. |
|
|
|
|
|
9 |
| TXD | I | Transmit Data: Serial data are transmitted from |
|
|
|
| the datalogger to the modem on pin 9; logic low |
|
|
|
| marking (0V) logic high spacing (5V) standard |
|
|
|
| asynchronous ASCII, 8 data bits, no parity, 1 start |
|
|
|
| bit, 1 stop bit, 300, 1200, 9600, 76,800 baud (user |
|
|
|
| selectable). |
|
|
|
|
|