Specifications

Chapter 2 Installation and Setup ASM-10/8 Installation and Operation Manual
2-6 Installation and Setup
Table 2-1. ASM-10/8 Internal Jumpers and Switches (Cont.)
Item Jumper Description Values Default Setting
15 DIP Switch The DIP switch consists of four sections. The S1 section is reserved for future use.
S2 Selects the amount of stop bit
shortening to be used in async mode.
ON – 25%
OFF – 12.5%
OFF
S3, S4 Selects character length in async mode
S3 S4 No of bits
OFF OFF 8 BIT Refer to Configuration Considerations
below for detailed explanation.
OFF ON 9 BIT
ON OFF 10 BIT 10 BIT
ON ON 11 BIT
Configuration Considerations
Setting AGC and CTS Delay
ASM-10/8 receiver consists of the following components:
• Receiver filter, which removes all the out-of-band frequencies.
• Automatic equalizer, which comprises several equalizers activated according
to baud rate.
• Digital AGC, which automatically compensates for the attenuation of the line.
The following are general recommendations for the setup position of the AGC and
CTS delay:
For point-to-point applications, set AGC to ON and CTS delay to 8 msec.
In multipoint or star applications, the AGC and CTS delay settings depend on the
distances between the modems (see Table 2-2 and Table 2-3).
Table 2-2. AGC and CTS Delay Settings for Short-Range Applications
Range Rate AGC Setting CTS Delay Setting
9.6 to 19.2 kbps
3.6 to 7.2 kbps
CTRL (master and slave) 0 msec (master)
4.8 kbps 8 msec (slave)
2.4 to 4.8 kbps 8 msec or 64 msec (slave)
Less than 4.5 km
6 km
2.4 kbps and below 64 msec (slave)
Note: The selection between delays depends on the polling environment behavior. Therefore, it is different
from application to application