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SHM-B ASYNC
Table 1. EIA-232 Pin Connections on SHM-B
Pin Number Signal Name
1 Protective Ground
2 Transmit Data/Receive Data (TD/RD)*
3 Receive Data/Transmit Data (RD/TD)*
4 Request to Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground
8 Carrier Detect (CD)
20 Data Terminal Ready (DTR)
*TD and RD can be reversed using the DTE/DCE switch, S1 on the circuit board. See
Section 3.3 for details.
3.3 Switch Settings
Refer to Figure 1 in this chapter. Switch S1 is used to
reverse the TD and RD lines on the EIA-232 interface.
This eliminates the need to swap these two lines in your
EIA-232 cables. If you connect the SHM-B to your
equipment using a “straight-through” or “2:2” cable,
then S1 must be set to the opposite of your device’s
configuration. For example, if your device is configured
as DTE, select DCE on S1. If you use a “2:3” or “3:2”
cable to connect the SHM-B to your equipment, then
the setting for S1 will be identical to your equipment’s
setting. Refer to your equipment’s manual for