SHM-B ASYNC
TX+ | RX+ |
TX- | RX- |
RX+ | TX+ |
RX- | TX- |
SHM #1 | SHM #2 |
Figure 2. Wiring diagram for two SHM-B units.
3.2 EIA-232 Connection
Connect the SHM-B to your computer or terminal with a standard EIA-232 cable and DB25 connectors. Refer to your equipment’s installation manual if you need information on the exact EIA-232 signals required for your equipment. Often, it is best to use only the Transmit Data (TD), Receive Data (RD), and ground lines if your equipment does not require the use of the control signals Request To Send (RTS), Clear To Send (CTS), Data Set Ready (DSR), etc. The SHM-B generates levels for the control signals if you need to use them. The table shows the pin connections at the SHM-B.
